Friday, November 20, 2009

Calculating number of moles, density, and mass?

Use the following information about air trapped in a flask:





The air is 82.0% nitrogen and 18.0% oxygen (by number of moles).


Pressure = 0.984 atm


Temp = 25.1 deg. C


Volume = 1.039 L





R = 0.0821 L*atm/mol*K


N = 14.01 g/mol


O = 16.00 g/mol





a)How many moles of gas are there in the flask?


b)How many moles of nitrogen gas are there?


c)How many moles of oxygen gas are there?


d)What is the overall density of the air?


e)What is the mass of air in the flask?





You don't have to answer all of these, but anything would help. Thanks.

Calculating number of moles, density, and mass?
a). n = pV/RT


b.) moles of gas (n from a) * nitrogen(.78)


c.) moles of gas(n from a) * oxygen (.22)


d.)( answer b*(the weight of nitrogen(28.02))) + ( answer a*(the weight of oxygen(32)))


e.) answer d * volume (1.039)
Reply:OMG we just had a test on this stuff... why can't I remember?


Determine number of moles?

Determine the # of moles of each type or ion in one mole of the following compound. Determine the # of moles of each atom present in ine mole of the ion


a. KNO3





b. Na2SO4

Determine number of moles?
1a. moles K+ and NO3- in KNO3


--1 mole K+


--1 mole NO3-





1b. moles Na+ and SO4-2 in Na2SO4


--2 moles Na+


--1 mole SO4-2





2a. moles K, N and O in KNO3


--1 mole K


--1 mole N


--3 moles O





2b. moles Na, S, O in Na2SO4


--2 moles Na


--1 mole S


--4 moles O





it's all about the subscripts.
Reply:a mole is 6.02 x 10 ^ 23rd power





so ussually you have to find the mass from the periodic table of elements and add them to give you the total mass of Na2SO4





Get your chemestry book and plug in the equation from there lol its quite simple I finished the chapter on moles last semester but baked my brains with the ganja so ... its vivid... but yea anyway plug it in man thats how I aced the test ... good luck dogg


Would having large moles on your arms influence your decision to wear sleeveless tops?

My friend was wearing some cool jeans; I told her they would look really great with a sleeveless top and she could borrow one of mine, but she became a bit shy and told me she was really self conscious about the moles on her arms and that's why she didn't wear short sleeves or sleeveless. It's a pitty because she is very attractive and I think she is missing out on a lot in the clothing line.





To be honest I have seen her moles and they really are quite large like as big as your fingernail. A couple of them have got big hairs growing out of them. They are a bit icky and I wouldn't want anything like that on my arms. I tried to console her and said that people wouldn't notice and she has nice arms (which she does, apart from the moles).But I felt a bit useless. I could see she was upset about it.





Anway, would anyone worry about large moles if they wanted to wear short sleeves. What I can say to help her out because I feel bad about mentioning the sleeveless top in the first place.

Would having large moles on your arms influence your decision to wear sleeveless tops?
If she is concerned she can have them removed...wearing nice clothes and feeling attractive is important and not to be trivialised...you can't lie and say they are unnoticeable but you can be constructive....she has options.
Reply:It might be a good idea for her to have them checked out, especially the ones with the hairs in, just to know that they aren't cancerous, and they can easily be removed. Report It

Reply:She has to be confident with herself, if she didnt have the moles people would find something else to talk about anyway. You live life once, relax and enjoy, tell her to wear the damn shirts, sleeeveless ones i mean
Reply:no, it wouldn't influence me, because I'm comfortable with my body, I know that most people have atleast one thing they hate about thier body, so I would just tell her that theres nothing she can do about it so she might as well wear her moles proudly, it could be worse. Plus most people won't be thinking about the moles on her arms, but how great her outfit looks!
Reply:Well she shouldn't be a shamed of them. If she really doesn't like them and it's that big of an issue she could have them removed, or idk pluck the hair that's growing out of it. Personally I don't think it should matter and besides ppl will get used to it after a while and they wont even care, it's just the way her body was made and she shouldn't feel like she has to hide.
Reply:I know someone who had birthmarks a LOT lighter than her skintone and she is not bothered one bt and they cover a good 50% of her body. I'd tell your friend to Go get 'em, and if anyone laughs heres a good line to say:


friend:"Get a life!"


bully:"I have one"


friend:"Then why are you spending it worrying about me?"
Reply:Just tell her to wear an arm band or something to cover the moles up. Until she gets enough self-confidence that is.
Reply:look she is a girl there is nothing you can say to change her mind.


if she doesn't like the moles there then get them removed its the only way she'll feel confident!


and to your question YES i would feel a bit nervous about wearing short selves tops around other people and in public.
Reply:When i was younger i used to self harm which i reget doing but my arms are covered in scars, i used to wear long sleeve tops all the time to hid them because i felt embarrassed but one day my friend said to me if people dont like it or stare at you they are not worth knowing or having as a friend so i stopped worring and started living life, but if they are really bad and making her feel upset maybe she could go to doctors and see if there is anyway she could get them removed, my auntie had one on her face and she recently had it removed so this should be possible
Reply:Honestly, if she is that worried about it have her go to the doctor. But there is more to a person than looks. I really think you did the right thing, butshe should get over it.
Reply:Yikes!





Well if I had large moles (and judgeing by what you wrote, she has more than 2) on my arms, I would be worried about showing them off too. And it would influence my decision on what I wear. But here's the thing, a friend of mine had a similar problem. Except that the moles weren't as big and they were on the left side of her face + forhead. What was amazing was that one day I noticed that they had disapeared. Surprised and dumbfounded I asked her what the heck happend, and she told me that she got them removed. But not through laser removal or surgery, she got this natural mole removal stuff online. Well, it worked pretty good, it left a bit of redness where the moles used to be, but you can hardly tell she had moles and it just looks like a bit of normal blemish on the face. I don't remember what website she got the stuff from, but I can ask ya if you want. A "mole removal" search on yahoo or google should get ya more info too. Anyways, hope I helped! Cheers!
Reply:if they are big aweful moles i wouldn't wear a top that would show them off but if they are small or freckel like it wouldn't bother me not one bit...
Reply:I myself sort-of have that problem myself. But don`t fret. Most of them are freckles. I wouldn`t worry about it. For some of them you could try to put make-up on them. I`m sure your friend is just a little self-consiouse, she`s probably going through that teen-harmone thing.
Reply:I have freckles and have never worn short sleeves in my life !
Reply:I have a large mole, one of those big lumpy brown types (ew) on my arm were my elbow joins the top of my arm. It has never concerned me and i have never felt self concious about it and i always were short/sleeveless tops. People however do mention it alot, but i just shrug there comments off.


I suppose there is always the option of having them removed??
Reply:A mole on the arm is better than a ferret down the trousers.
Reply:I think she should speak to her doctor about having them removed. If they are actually that large they could get ripped by clothing catching on them, or become cancerous if she sunburns badly.





But just for cosmetic reasons? No. If its affecting her self-confidence, then possibly.
Reply:unless i had large moles i couldn't say.i have bat wings but i don't worry.
Reply:well i have a mole on my arm but i call it a beauty mark. tell her that everyone has imperfections and if you show people that you do not care then they will also not care.
Reply:i would worry i recently had 4 middle sized moles removed from the back of my neck as this would always put me of wearing my hair up because people would flick them. so i can deffinatley sympathise with her. she should enquire with her gp and get them checked out if they are large. she may be able to get them removed, its very easy , they can cut them using local anesthetic, or they can be burnt. i hope this helps. good luck to your friend.
Reply:she could have it removed.
Reply:It shouldn't matter whether or not she has moles, I don't think they're icky at all. She could try surgically freezing them off as an option but I heard that some grow back.
Reply:NO
Reply:Tell her to put them back in the garden where they belong there is enough animal cruelty as it is
Reply:if she has them on show and somebody likes her for other reasons they will not be bothered by the moles, which might be a problem if they see them after a relationship has formed any way beauty is in the eye of the beholder

dendrobium

Chem:moles question?

How many moles of potassium bromide can be produced from the reaction of 2.92 moles of potassium with 1.78 moles of bromine gas?





2 K(s) + Br2(g) → 2 KBr(s)





a.3.56 mol


b.5.84 mol


c.1.78 mol


d.1.46 mol


e.2.92 mol





is the answer e?


thanks

Chem:moles question?
yes, the answer is e
Reply:Yes. The answer is "e"





All the bromine gas won't be reacted, since 2.92 mol K will only react with (2.92 / 2) 1.46 mol of Br2 before being exhausted.





Since 2 mol KBr are produced for every 2 mol K reacted, 2.92 mol K will produce 2.92 mol KBr
Reply:Yes its e.
Reply:Member since: January 31, 2007


Total points: 1,939 (Level 3)


Points earned this week:


--% Best answer





not gh3y


0


Yes. The answer is "e"





All the bromine gas won't be reacted, since 2.92 mol K will only react with (2.92 / 2) 1.46 mol of Br2 before being exhausted.





Since 2 mol KBr are produced for every 2 mol K reacted, 2.92 mol K will produce 2.92 mol KBr


Do moles make me unattractive!!??HELP!!!?

I am attractive, but I hate my moles! I keep getting more and more! I have some on my back eew and on my arms and everywhere! How much do moles detract from beauty???!!! I try to tell myself it doesnt matter but they are just so annoying and i wish i didnt have them!!!I keep thinking i would be so much prettier without them, am I overeacting or is it normal i feel like this???Or it is true that moles are very unattractive???

Do moles make me unattractive!!??HELP!!!?
They aren't very unattractive, but new moles appearing doesn't sound entirely normal.





You might actually want to see a doctor - moles can be a sign of skin cancer.





Here's a site with some information on that: http://www.netdoctor.co.uk/diseases/fact...





If you get the moles checked out and they are fine, if you really feel insecure about them, they can be surgically removed.





Personally, I have moles on my neck and upper back and a few elsewhere. It runs in my family. It bothers me a little, but I don't really feel that they cause unattractiveness in me. Moles are normal and just about everyone has a few.
Reply:Your sooo overreacting,its natural,everyone has them.=]
Reply:moles are a sign of beauty, be proud of your moles and just ignore them,
Reply:be lucky u dont have any on ur face like i do.
Reply:Yes, moles are somewhat unattractive, so stop hanging out with moles. Beavers make much better bodyguards anyway.





Seriously. Some people actually draw moles onto their faces. Moles are not that bad. I dated a girl who had what looked like a map of Europe across her back. Her skin was a different pigment in that area. I thought it was fascinating, but she would have had a skin graft if she could have gotten away with it. Watch the moles and if they start changing shape, or erupting, get them checked by a physician immediately. In certain rare cases they can become cancerous. Otherwise, learn to live with them. Give them pet names and joke around a little bit about them. Get comfortable in your skin. It's the only birthday suit you're gonna get.
Reply:No, I don't think moles can make a person unattractive!
Reply:YOU are overreacting. Do not worry about it! You are beautiful the way you are and do not let nobody tell you different! No one! My mother had a mole up under her nose and she had it all her life! She looked beautiful no matter what. As she got older, she surgically had to get it removed due to it getting bigger and she couldn't breathe through her nose because it was getting so big, it would clog up her breathing.. But she rocked it for many many years! It gave her sexy and unique'ness when she had it!


My Moles sometimes turn into sores, why is this?

I have lots of moles all over my body, but every once in a while one or more of the larger moles form a sore on it and then it doesn't even look like a mole anymore. It usually takes a couple of months to heal. What could be going on?

My Moles sometimes turn into sores, why is this?
I id a bit of searching on the medical websites, and it states that changes in moles or sore moles could be a sign of a type of skin cancer. I suggest seeing a dermatologist right away.
Reply:eek!


Get to a skin doctor right away.
Reply:Go to the dermatologist now!
Reply:see a dermatologist, you could have skin cancer.
Reply:Could be melanoma, skin cancer...but could be a psoriesis or eczema too. SOunds like the latter if it heals. SOme is rsponsive to light treatment with heathy UV rays...sunlight keeps outbreaks down.
Reply:ANY mole that changes in size or color should be examined by a Dermatologist for skin cancer. It can easily be removed. You may also have your clothing rub against it, irritating it. Do yourself a favor and get it checked.


Determine the number of moles of each type of monatomic or polyatomic ion in one mole of the following compoun

Determine the number of moles of each type of monatomic or polyatomic ion in one mole of the following compounds. For each polyatomic ion, determine the number of moles of each atom present in one mole of the ion.





WHAT I'M ASKING IS PICK ANY ONE OF THESE AND EXPLAIN THE STEPS YOU USED TO GET IT BECAUSE I DON'T KNOW HOW TO SOLVE THESE TYPES OF PROBLEMS.





a.) KNO3


b.) Na2SO4


c.) Ca(OH)2


d.) (NH4)2SO3


e.) Ca3(PO4)2


f.) Al2(CrO4)3





I WILL GRANT 10 POINTS TO THE PERSON WHO ANSWERS MY QUESTION!!!

Determine the number of moles of each type of monatomic or polyatomic ion in one mole of the following compoun
Chapter 7 Review


Pg. 236


# 31





(just look back at pg. 223--Practice problem #1)
Reply:Well let's say we have 1 mole of KNO_3.





Now to start you have to ask yourself, which parts of this compound are the cations (positive) and anions (negative).





Well I happen to know that K is the cation as it is placed first, and N0_3 is the anion, placed after.





Now we need to know how many of these cations and anions are in one single molecule of the compound. Well we check the subscripts to determine that:





KNO_3 can be written as:


(K)(NO_3)





So from here we can see that 1 moleclue of KNO_3 is made of 1 K cation and 1 NO_3 anion.





From this we can transfer everything over:





For 1 mole KNO_3 there are 1 mole of K cation and 1 mole of NO_3 anion.





So, basically figure out the cations and anions, figure out how many of each are in one molecule and transfer that to moles.

broadleaf

How to convert each quantity into Moles of Sulfur??? HELP!!!!!!?

I must round off correctly and show the calculation setup. I did a few on my own, but these are a little complicated for me.


Any help would be appreciated.





1.) 2 moles of SnS2?





2.) 3.01 times 10 to the 23rd power molecules of H2S?





3.) How many grams of O in 2.10 moles of H3PO4(aq)?





4.) How many moles of H in 1.20 moles of H3PO4(aq)?





5.) How many moles is 49.00 grams of H3PO4(aq)? How


many molecules is that?





6.) Okay, for this one, I did the first part of it which is:





Convert 5.40 grams of boron to moles? The answer I got


was 0.500 mol of B(Boron) right?





Now the next part says:





How many atoms of boron is that? So, I multiply 6.02


times 0.500 mol B and the answer I got was 3.10 times


ten to the 23rd power?





Thanks!

How to convert each quantity into Moles of Sulfur??? HELP!!!!!!?
2 moles of SnS2 contain 2x2 = 4 moles of S





3.01x10^23 molecules / 6.02x10^23 moles/mole = 0.500 moles of S





2.10 moles H3PO4 x 4 moles of O/moles of H3PO4 x 16 g/mole of O atoms = 134.4 g O atoms





1.20 moles of H3PO4 x 3 moles of H per mole of H3PO4 =3.60 moles of H atoms





49 grams of H3PO4 / 98 g H3PO4 per mole = 0.50 moles of H3PO4





5.40 g B / 10.81 g per mole = 0.500 moles


0.500 moles x 6.02x10^23 atoms/mole = 3.01x10^23 atoms
Reply:One time I popped my mole and it smelled like sulfur.


Facial mole removal ..Moles are painful?

I am a Black Woman whos's family trait is facial moles, the older I get the more I get and I hate it because some are painful. They are across my cheeks %26amp; side of my face, They are not bad I just want the raised ones and the ones that are too close together removed. But I am affraid of the ouctome will I scar? will I swell? I mean this is in my face under my eyes. They are painful when they grow in and when they are ready to fall off. I want to know has anyone ever expeience this and had the moles removed and which procedure will be the best for minimal scarring......Thanks

Facial mole removal ..Moles are painful?
my doctor removed a mold on the side of my neck the stitches will obviously show until they are removed but if you put Vaseline on your scar and stitches 2 times a day the scar will become softer and lighter until you cannot tell where you had a scar also your skin peels away and as you get new skin cells your scar will g back to almost your skin color but Vaseline makes a big difference
Reply:My sister had a large mole above her lip and over the years it got bigger. She went to a plastic surgeon who removed it with minimal pain and it has been about 7 months and you can't even see a scar. She put cream for scars on it when it was done healing. I think insurance will cover it too if it is causing you pain.
Reply:I have had moles removed and the pain is like a small bee sting and then it is cut away. There is still a mark but the raised parts are gone. I dont recall any swelling.


How to calculate moles and total moles?

calculate Ca2+ moles in 10mL hard water sample and ppm


i have an EDTA moles of 0.1000M.


do i calculate this by saying (0.01L)(0.1000M)


but i also have a titre value, of 9.70. where does that go or does it ?





secondly i have to calculate total moles of Mg2+ and Ca2+ in the 10ml hard water sample: how do i do this: i know there is a 1:1 ration. do i use the m1v1=m2v2


m1 whatever the calcium is? and v1 would it be the tire? and the v2 would that be the 10ml?


not sure?

How to calculate moles and total moles?
You haven't explained the details clear enough to be able to help. I'm not sure you really understand the experiment yourself, I have a feeling you may have just "cook booked it" and are now trying to figure out what to do with the values that you got.





The experiment involves complexing EDTA with Ca+2, and Mg+2 in tap water. You are given a standardized solution of EDTA - so you don't even have to worry about having to figure out the concentration of this solution - it is known - all you have to do is know how much EDTA you titrated into the samples to complex the Ca+2 and Mg+2 and then figure out based on the volume of EDTA used how much Ca+2 and Mg+2 must have been present.





The second part is just a dilution factor, if you had 10 ml of a solution and diluted it to 1000 ml ( or 100ml) then you would adjust your dilution value by 10/1000 (10/100) accordingly. The moles of Ca and Mg in the solution stay the SAME - it's just they are more diluted! - do you see the difference?


Chemistry moles?

1.how many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas? what is the limiting reagent?





2. what is the mass of water produced from the reaction of 24g of H2 and 160 g of O2. what is the limiting reagent?

Chemistry moles?
First you need to write a balanced chemical equation for water.





2H2 +O2 --%26gt; 2H2O





Then, using the coefficients from this equation, you can determin the limiting reagent. 4 moles of oxygen would form 8 moles of water. 16 moles of hydrogen would make 16 moles of water. Therefore, oxygen is the limiting reagent, and only 8 moles of water will form.





In order to answer question 2, you need to convert grams to moles. 24 grams of H2 is the equivalent of 12 moles of H2, since 24 g H2 x (1 mol H2/2 g H2) = 12 moles H2.





160 grams of O2 is the equivalent of 5 moles of oxygen. Ten moles of water are then expected to form from these 5 moles of O2.


You can convert 10 moles of H2O to mass by multiplying by molar mass-- 10 moles H2O x (18 g H2O/1 mol) = 180 g water.

night jasmine

Chemistry moles?

i dont get any of this... how do i do it? show your work plz





how many moles in each of the following? use correct significant digits





25g of SO22





219g of HCl





35g of CO2








and part two


how many grams in each of the following


0.035 moles of KOH








and party three


calculate the molar mass of each of the following





0.0025moles weighs 0.40g





3.9 *10^3 moles weighs 117kg

Chemistry moles?
The mole is a measure of the amount of a substnace that is present. It is a measure of the number of molecules or atoms that are present, therefore for atoms or molecules that have a greater atomic weight, it takes more mass for there to be a mole of material present. For example, on the periodic table you will see helium have an atomic number of 2 and an atomic weight of 4. This atomic weight of 4 means that for there to be 1 mole of helium present, there must be 4 g. Likewise, for lead, Pb, the atomic weight is 207.2, so there must be 207.2 g present for 1 mole of lead to be there. The mole is an absolute measure, meaning it is an absolute measure of the number of molecules or atom in a sample. In the above examples, if there are 4 g of He present and there are 207.2 g of Pb present, then they both have the same number of atoms present in the sample. I hope this explains the concept of the mole. Now to answer a couple of your questions.





I think you mean SO2 (not SO22). To get the atomic weight of SO2 you need to add the atomic weights of each element present to get the atomic (or molar) mass of the molecule. In this case 1 sulphur and 2 oxygens. The atomic weight of sulphur is 32 and the atomic weight of oxygen is 16 so:





Molecular weight of SO2 = (1*32) + (2*16) = 64 g/mol of SO2


now to determine the number of moles present in 25 g, you just need to use the molecular weight of SO2 as a conversion:





25 g * (1 mol/64 g) = 0.39 mol of SO2





THe other ones are done the same way, by adding the atomic weights of each element to ge tthe molecular weight of the molecule, then using that as a conversion to moles.





The strategy for part two is the same except that you are now converting from moles into grams.





Part three is where you need to be aware of the units on the numbers and be sure that you know what you are after as an answer. THe molar mass is expressed in grams/mole, so you have the mass in grams and the number of moles for each of these and you just need to set up the numbers and units to give you the units in the order that is needed. The first one is:





You need to get grams/mole, therefore, set up the numbers just like that:





0.40 g/0.0025 mole = molar mass of substance





Now just divide this out





0.40 g/0.0025 mol = 160 g/mol





The last one is done the same way, but you are working with different numbers.





Hope this helps
Reply:Just think this way: a dozen means 12. Half a dozen means 6. Likewise, a Mole means 6.022 x 10e+23 ( or an Avogadro's number). The weight of ONE mole of a given substance is called the Molar mass (common symbol Mw). One mole weighs one times the molar mass. 2 moles weigh 2 times the molar mass.


I'll solve the first one for you, approximately. 1 mole of SO2 weighs [32+(2x16)], which means in approximately 64 g of SO2, there's one mole of SO2. So, if 64g contains one mole, how many moles are there in 25g?


(25/64) moles (approximately).
Reply:1) moles = grams/Molar Mass





Molar mass is the mass in grams of the sum of the atomic masses of all the atoms in a formula.


Ex. CO2: 1C x 12. + 2 O x 16 = 12 + 32 = 44grams/1mol





Find mol:= 35g/44g/mol = 0.80 mol CO2





2) mol = g/MM





to find g, rearrange the formula: g = mol x MM





KOH: find MM = 1 K x 39.1 + 1 O x 16 + 1 H x 1.01 = 56.1g/mol





g = mol x MM = 0.035 mol KOH x 56.1 = 2.0 g KOH





3) mol = g/MM





to find MM, rearrange the formula: MM = g/mol





MM = 0.40g/0.0025mol = 160g/mol or 1.6 x 10^2g/mol


Chemistry, moles??

ok so moles are stupid and hard to understand... i understand the very basics.. now the stupid teacher has gone psycho and i dont understand...





here are a few weird questions





a sample of 22.76 grams of aluminum dihydrogen phosphate has.. how many moles of compound?...how many moles of oxygen in it??? how many grams of oxygen in it?





well i have a billion more questions... and if i up them all up... chances are... nobody is gonna anwer them... can someone explain how to do number one?... it would REALLY REALLY ReALLY help if u drew a pic on like... microsoft paint or something...





thanks a ton...(exam like... friday... and... dont know how to do like any of this...)

Chemistry, moles??
Here's a crappy diagram of the conversions.


I'm not sure if you would understand it,


http://img.photobucket.com/albums/v66/Ka...





Using this diagram..


http://img.photobucket.com/albums/v66/Ka...





edit: oops i made a mistake. in the last part, it should say convert mol of O to grams of O
Reply:One mole is equal to 6.022 x 10exp.23 paticles, atoms, or molecules. It's always gonna be that #. Just use it to convert. Report It

Reply:grief...that is all I can say about chemistry. Equations drove me nutts...If you don't know it by now, ask if you can be tutored after class for an hour after each class. Otherwise...it's gonna be rough.


I passed it, but it was helloooo!


(@v@)





Good luck and PRAY ♥
Reply:No giving up....





Your item in formula is Al(H_2PO_4)_3





the _2 is sub 2 and _4 is sub 4





If you add the 1 Al + 6 H's +3 P's +12 O's you will get grams in a mole of compound.





In one mole of Alum Dihy phos you have 12 moles of oxygen....or you might say 6 moles of O_2 since that is how oxygen is usually found.





and then just multiply by (I think 32) for O_2 for number of grams.


I have 2 moles on my vagina does any one El's have moles down there?

please help i have 2 moles down there and yes they are moles im so self consuse about them i will never have sex with the light on can i get them removed and would it hurt. and how did they get there i thought you only got moles from the sun trust me down there wouldnt even kon wat sun was. please help

I have 2 moles on my vagina does any one El's have moles down there?
wtf. You don't need to get moles removed unless they're painful or discolored. I think I have one or two down there. They're beauty marks.





Have you seen a penis yet? Do you know how ugly they are? They're ugly. They're uglier than moles. You have no reason to have surgery; it would be expensive and unnecessary. Your "down there" will be more beautiful than any male "down there" you ever see.
Reply:I have a mole down there too, I used to try and hide it too. I would never let my bf go down on me but then I did let him. I know he's seen it and he says he loves me the way that I am but I want to get it removed for my own personal reasons, but it shouldn't be anything to be embarrassed about. Report It

Reply:were are they, ouside or inside?


How to convert each quantity into Moles of Sulfur??? HELP!!!?

I must round off correctly and ahow calculation setup. I did a few on my own, but these are a little complicated for me.


Any help would be appreciated.





1.) 2 moles of SnS2?





2.) 3.01 times 10 to the 23rd power molecules of H2S?





3.) How many grams of O in 2.10 moles of H3PO4(aq)?





4.) How many moles of H in 1.20 moles of H3PO4(aq)?





5.) How many moles is 49.00 grams of H3PO4(aq)? How


many molecules is that?





6.) Okay, for this one, I did the first part of it which is:





Convert 5.40 grams of boron to moles? The answer I got


was 0.500 mol of B(Boron) right?





Now the next part says:





How many atoms of boron is that? So, I multiply 6.02


times 0.500 mol B and the answer I got was 3.10 times


ten to the 23rd power?





Thanks!

How to convert each quantity into Moles of Sulfur??? HELP!!!?
There are many ways of finding the infomation you want, and I have included the links you will need to help you. Of course, in addition to this, you can also use the resources at your local library, they are only too happy to help you with your searches and queries.





http://www.google.com





http://www.wikipedia.org/





http://uk.search. yahoo.com/web





http://find articles.com/





http://vos.ucsb.edu/ index.asp





http://www.aresearch guide.com/





http://www.geocities.com/athens /troy/886...





http://www.studentresearcher. com/search/...





http://www.cha cha.com/

frangipni

Cost for getting mulitple moles removed?

Hello. I have searched through the web and this site for an answer, but found nothing that satisfies me.





Basically I have a lot of small moles on my upper chest and upper back, and also a few in other areas. Some of them are small flat ones, and others are raised. I don't have any huge ones, I would say they are all pretty average sized. Lets say I have about 20 I want removed.





Does anyone know how much this would cost without insurance? I do have insurance, but I'm not counting on all those moles to be dangerous.





I honestly don't even know if every mole is able to be removed. Can a small flat one be removed, or does it have to be raised? I would assume any mole could be removed though.





I found two products that say they remove moles, but I don't know if I can trust them:


http://www.wartmolevanish.com/cgi-bin/wm...


http://www.moleremoval.net/





Any feedback on this would be great, thanks a lot =]

Cost for getting mulitple moles removed?
Any type of mole can be removed. I've had a few removed myself and my insurance paid for them all actually....whether they were "dangerous" or not. It might depend on your insurance though so why not give them a call? The doctors office would help answer any questions you have about getting them removed as well. Its always a good idea to get rid of them though because later on in life they become more of a problem. I would skip those products though and get them taken care of by a doctor. Good Luck.


Calculating fractions of moles of solute that dissociated from the observed van't hoff factor.?

I thought that the van't hoff factor is the moles of particles in solution divided by moles of solute. Because the observed van't hoff factor is less than two for my sodium chloride solution, wouldn't the equation be (2X+Y)/(X+Y)=i ? Where x is the moles of solution that will be dissociated, and y is the moles of solute that will remain clumped. assuming X+Y=1, then 2X+Y=i =%26gt;


2X+1-X=i =%26gt; X=1-i ...and the percent of dissociated sodium chloride would be X/1 multiplied by 100?


Can someone tell me why this is wrong?

Calculating fractions of moles of solute that dissociated from the observed van't hoff factor.?
Your equation is completely wrong.





i is a correction factor for the fact that you have more particles than you would expect from the molecular formula.





If you have N particles of a weak electrolyte that has degree of dissociation a and in theory gives n ions for 100% dissociation according to the molecular formula, then the particles you have is the number of ions that come from the dissociation plus the non dissociated particles.





The free ions are n*a*N


The non dissociated are (1-a)N


Thus the total number of particles in solution is


naN+(1-a)N= (na+(1-a))N





The ideal would be when you have 0 dissociation, thus N particles





so i=(na+(1-a))N/N=na+(1-a) =%26gt; a=(i-1)/(n-1)





NaCl is a strong electrolyte but at high concentrations you have ion pairing and i%26lt;2, so you could treat it as a weak electrolyte and determine a. In your case n=2, i you have an experimental value, so you just plug the values in the equation.


New moles - Cause for concern?

I have 2 new moles - One on my stomach and one just below my armpit. Should I be concerned? I've been told by some people not to worry and this is natural but others say to go get it checked out.


The one under my armpit is fine, its just like a regular mole, but the on on my stomach is much smaller - more like a pimple or a scab, and it itches like crazy. (its not a pimple)


Its also appeared right next to my other mole (which is massive, embarassing)

New moles - Cause for concern?
Dark (almost black) or irregularly shaped moles are a cause for concern.
Reply:Moles are not suppose to be itching. Go to your doctor right away.
Reply:If you are concerned I would get them seen about. I would look at the size, shape and color( even if you have to take pictures) that way you would notice any changes. If it gets darker, starts to drain, or the boarders are irregular then get it check out immediatly.Many times if a mole is cancerous they doctor can remove it and you wouldn't have any more problems.
Reply:I would go to the doctors and have it removed. It hurts a little but its worth it.
Reply:A- asymmetry. Suspicious mole does not look like a round or oval blot. Often, early melanoma looks rather like a blot with an odd shape.





B- borders. Borders become irregular, uneven, fuzzy. The edges of the blots become notched.





C- color. Color of normal mole should be more or less homogenous. Change in color is very suspicious . There are shades of brown, black, tan, red. Mottled color is suspicious.





D- diameter. Change in diameter is suspicious too. Mole that is bigger than 6 mm is suspicious. Everybody compares 6 mm to a pencil eraser (though few people actually use it extensively). Just to get idea about the borderline size.


How do you get moles in places that never see the sun?

My boyfriend has a mole on his ball sack, or scrotum... He never lets his privates see the sunlight. When I was younger I had a mole on my outter labia that has never seen the sun either. I had it removed by the dermatologist but it wasn't cancerous. so I guess I'm wondering how do we get a single mole in a place that never gets sun??





I want him to see the dermatologist to check it out because to me it looks a bit suspicious. I don't know if it can be pre-cancerous if it's never seen the sun, but then again, can it?





Can moles develop without sunlight? Should this mole be checked out? It's really dark brown, verrrrry slightly raised, irregular shaped. How do I get him to let the dermatologist check it out? he's embarrassed about these kinds of things. Thanks.

How do you get moles in places that never see the sun?
It doesn't matter if the skin is exposed to the sun--I think (going off of a year of college biology here) that moles are result of a virus (that like 90% of the population carries).





I would get it checked out--yes, it's embarassing, but worth it if he really did have cancer (odds are so, so good that he doesn't) and caught it early.
Reply:I have a freckle on my left bum cheek :}
Reply:It's usually hereditary - but I don't recommend examining his family tree too closely in this instance. Have any mole checked that bleeds, itches, or changes size and/or shape. Have a healthy and happy new year!

bleeding heart

HeLP! MOLeS ASSIGNMeNT! ASAP!?

1. Determine the molar mass of


(i) potassium


(ii) hydrogen gas


(iii) ammonium sulfate (NH4)2SO4.





2. Calculate the number of moles of nitrogen atoms in 46.00 g of nitrogen.





3. Determine the mass of 0.075 moles of sodium sulfate, Na2SO4.





4. In 126.036 g of nitric acid, HNO3, calculate the number of moles of:


(i) nitric acid molecules


(ii) hydrogen atoms


(ii) oxygen atoms





5. An alcohol molecule consists of 37.5% carbon, 12.6 % of hydrogen and 49.9% oxygen.


(i)Calculate the empirical formula of the alcohol.


(ii)If the molar mass of the alcohol is 32.042 gmol-1, determine its molecular formula.





6. Calculate the percentage, by mass, of chlorine in sodium hypochlorite NaOCl.





7.Octane undergoes complete combustion according to the equation:


2C8H18(l) + 25O2(g) = 16CO2(g)

HeLP! MOLeS ASSIGNMeNT! ASAP!?
1.


K = 39.1


H2 = 2.02


(NH4)2SO4 = 132





2. 46 / 14 = 3.28





3. Molar mass = 142 g/mol


0.075 mol x 142 g/mol = 10.65 g





4.


Moles HNO3 = 126.036 / 63 = 2.00


Moles H = moles N = 2.00


Moles O = 3 x 2 = 6.00





5.


37.5 / 12.011 = 3.12 ( C)


12.6 / 1.00794 = 12.5 (H)


49.9 / 15.9994 = 3.12


divide by the smallest number


CH4O empirical formula( mass = 32.042) =%26gt; molecular formula CH4O





6. Molar mass = 74.44 g/mol


22.9898 x 100 / 74.44 = 30.88 % Na


15.9994 x 100 / 74.44 = 21.49 % O


35.453 x 100 / 74.44 = 46.63 %


Can someone expain moles to me?

here are some examples. Please dont just tell me the answer...


how do i find how many atoms are in 4.50 moles of Hydrogen?





how many moles are in there in 2.59 grams of neon?





what the heck? its so confusing... i dont even know what a mole is... can somebody please tell me how moles work and how i can use them and how i can solve those questions?... a picture would help greatly


(better change for you to get best answer *hint hint*)


lol ive asked many students... one said "oh you just solve it... just try it, it will work... just put the numbers in".... wow that helped a lot... i had no idea what he was talking about... few more students would not help me......





i asked the teacher twice... once he said No, i cant help you today, im going to play tennis... the next two days i went to his classroom after school and he wasnt there... today i asked him and he said maybe and left.....please sombody help! this chem teacher SUCKS

Can someone expain moles to me?
Each mole has 6.02 x 10^23 atoms in it, so to figure out the first problem, you multiply (4.50 moles)(6.02 X 10^23 atoms/mole) to get your answer. A mole is a standard unit of measurement, that you just have to memorize.





For the second problem, you find the mass of neon, given in the periodic table. That is what is called the molar mass of neon, which is 20.18, meaning that 20.18g of neon equals one mole of neon.


To solve the problem, you do (2.59 grams)(1mole/20.18 grams) and get your answers.


I hope that this was helpful.
Reply:Sorry you got such a disinterested teacher, but these websites should help. Good luck.


What Is a Mole and Why Are Moles Used?Find out what a mole is and why this unit is used in chemistry. ... A mole of carbon atoms is 6.02x1023 carbon atoms. A mole of chemistry teachers is ...


chemistry.about.com/cs/generalchemistr...





Molecules and MolesMolecules and Moles. ... Facts %26amp; Pictures%26gt; Chemistry Articles%26gt; Molecules and Moles ... Here is the formula to determing the number of moles of a sample: ...


chemistry.about.com/library/weekly/aa0...





mole, in chemistry — Infoplease.commole, in chemistry, a quantity of particles of any type equal to Avogadro's number, or 6.02×10 23 particles. One gram-molecular weight of any molecular ...


www.infoplease.com/ce6/sci/A0833619.ht...





Chemistry Mole Calculation ProblemDownload Chemistry Mole Calculator and Periodic Table. Chemistry Mole Calculation Problem. Determine the number of moles of 368 grams of H2SO4 . ...


home.c2i.net/astandne/help_htm/english...





What is a Mole?What is a Mole? A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12.


www.chemistry.co.nz/mole.htm - 11k


CHEMISTRY HELP!!! Moles of Elements?

1. Convert to moles


3.612 * 10^23 power





2.Convert to moles


59.3 grams of Carbon





3. Convert to mass in grams


5.00 moles Ag





4. Convert to number of atoms


25.0 moles Ar





and if there is a website to calculate that it would be great

CHEMISTRY HELP!!! Moles of Elements?
We meet again!





It feels like you are mistifying the concept of moles.





We've all been there, chemistry is a lot to take in and they trow this in as well.





OK like the first answerer said a mole of anything is 6.022x10^23 units of that thing.


It's the Avogadro's number. It just so happen to be the number of carbon atoms you need to make 12g or hydrogen atoms to make 1g, silver atoms to make 107.868g.





It is the link between atomic and bulk weight.





Neat hey? Right the questions.





You don't have to apologize for the first one. Wether it is iron, lead or copper, question 1 gives you a number of atoms.


Avogadro's number is a number of atoms as well....in a mole.





So for 1 the aswer is





3.612x10^23 atoms/6.022x10^23 atoms per mole= 0.60 mole





2. You now need the molar weight of carbon: M(c)= 12g/mol or g.mol-1





since you have 59.3g of C you have 59.3g/12g.mol-1 moles or 4.942 moles





3 is the reverse process ie: instead of having a mass and figuring out "how many moles is that? " you have the moles and want to know how heavy this is





Well as I mentionned the molecular weight aka molar weight aka weight per mole of silver is 107.898g.mol-1





so 1 mole of silver is 107.898 g





thus 5 moles is 5x107.898 = 539.49g





4. OK how many atoms in a mole?... The number of Avogadro or 6.022x10^23 atoms.





So in 25 moles....25x6.022x10^23 = 150.55x10^23 or


1.5055x10^25 atoms.





And no I don't believe there is such a site.





hope this answers your question well
Reply:one mole of ANYTING = 6.02*10^23 atoms. Grams of elements per mole (atomic weight expressed in grams) can be found at the link below
Reply:1. This one doesn't make sense. Which element is it?





2. Divide by the molar mass of Carbon.





3. multiply by molar mass of Silver.





4. multiply it by avagadros number (6.022X10^23)





good luck :)


Chemistry Calculations with moles?

I was given these 4 problems on moles and mole calculations but I honestly do not get it in the least bit. Can any one help explain it and possibly work through them? Thanks sooo much!





1) How many moles are present in 34 grams of Cu(OH)2?





2) How many moles are present in 2.45 x 1023 molecules of CH4?





3) How many grams are there in 3.4 x 1024 molecules of NH3?





4) How much does 4.2 moles of Ca(NO3)2 weigh?

Chemistry Calculations with moles?
For mass (grams) to moles problems, use the molecular weights found in the periodic table. If molecules/atoms are involved, use the Avogadro's number (6.02 x 10^23 particles/mole).





Just use dimensional analysis from there.





1) 34 g / (97.5 g/mol) = 0.35 moles





2) 2.45 x 10^23 molecules / Avogadro's number = 0.407 moles





3) 3.4 x 10^24 molecules / Avogadro's number * 17 g/mol = 96 g





4) 4.2 moles * 164 g/mol = 6.9 x 10^2 g

street fighting

Moles-working out no of moles present?

Determine the number of moles of of Na2CO3


present in 400 g.





Is there 1 mole each of NA and CO?


from there,how would i work it out?

Moles-working out no of moles present?
n(Na2CO3)=mass / Molar mass


= 400 / 105.989


= 3.77 mol





n(Na) = 2 x n(Na2CO3)


= 2 x 3.77


= 7.54 mol





n(CO3) = 3 x n(Na2CO3)


= 3 x 3.77


= 11.31 mol
Reply:what you do first is figure out what the molar mass of Na2CO3 is:





Na2: 2(22.99g/mol)=45.98g/mol


C: 12.01g/mol


O3: 3(16.00g/mol)= 48.00g/mol


________________________


Na2CO3: 105.99g/mol





use the # grams in sample and divide by the molar mass of Na2CO3





400g/(105.99g/mol)


or 400g x mol/105.99g





grams cancel out and you're left with moles





= 3.77394....moles


=3.77 moles correct to 3 significant digits


Tell how many moles of each element are in the following amounts of compounds?

a. 3 moles of NH3


b. 0.25 moles of H2O


c. 5 moles of H2SO4


d. 0.75 moles of Ca(NO3)2





i think i got the right answers but im gettin confused, just a ? wen u have more than 1 mole. say 4 example c. for hydrogen do u add the 2 n the 5 or do u multiply them together

Tell how many moles of each element are in the following amounts of compounds?
Okay,


First, convert moles to grams.


a.


N-14


H-1(3)


NH3-17


3 mole NH3 x [17 gNH3/1mol NH3] = 51 g NH3


--


b.


H-1(2)


O-16


H2O-18


.25 mole H2O x [18g H2O/1mol H2O] = 4.5 g H2O


--


c.


H-1(2)


S-32


O-16(4) = 64


H2SO4 = 98


5 mol H2SO4 x [98 g H2SO4/1mol H2SO4] = 490 g H2SO4


--


d.


Ca-40


[N-14


O-16(3) = 48]


x2 =124


Ca(NO3)2 = 164


.75 mol Ca(NO3)2 x [124 g/1mol] = 93 g Ca(NO3)2


=========


Now, find percent composition.


a.


N-14/17 = 82.4% N


H-1(3)/17 = 17.6%H


NH3-17


b.


H-1(2)/18 = 11.1% H


O-16/18 = 88.9% O


H2O-18


c.


H-1(2)/98 = 2% H


S-32/98 = 32.7% S


O-16(4) = 64/98 =65.3% O


H2SO4 = 98


d.


Ca-40/164 = 24.4%


N-14(2) = 28/164 = 17.1%


O-16(6) = 96/164 = 58.5%


Ca(NO3)2 = 164


=======


Now, use each percent and multiply by the total number of moles to find amount of moles in each substance.


a.


82.4% N x 3 mol = 2.47 mol N


17.6%H x 3 mol = .053 mol H


b.


11.1% H x .25 mol = .028 mol H


88.9% O x .25 mol = .222 mol O


c.


2% H x 5 mol = .10 mol H


32.7% S x 5 mol = 1.64 mol S


65.3% O x 5 mol = 3.27 mol O


d.


24.4% Ca x .75 mol = .183 mol Ca


17.1% N x .75 mol = .128 mol N


58.5% O x .75 mol = .439 mol O





I hope this helps.


Moles Question?

Sodium carbonate forms a number of hydrates of the formula Na2CO3.XH20. A 3.01g sample of one of the hydrates was dissolved in water to make the solution 250cm3. In a titration, a 25cm3 portion of the solution required 24.4cm3 of 0.200 mol dm-3 HCL to complete the reaction.





Deduce the number of moles of Na2CO3 in 25cm3 of the Na2CO2 solution and hence deduce the number of moles of number of moles of Na2CO3 in the original 250cm3 solution.

Moles Question?
3.01g dissolved in 250 cc means 4*3.01=12.04g/1000cc solution;


In the titration :





N1V1 = N2V2


Here N1 = 0.2M=0.2N HCl;


V1 = 24.4 cc


N2 = ?


V2 = 25 cc


Hence,





N2 = 0.2*24.4/25





or N2 = 0.1952 N sodium carbonate;





Equivalent weight of sodium carbonate is =46+12+48 =106 /2 =53g;


the strength of sodium carbonate =0.1952*53 =10.3456g/dm-3;


Number of moles = 10.3456/106 =0.0976 M; or 0.0244M


Moles in 25cm3 of Na2CO3 =0.0976/40 =0.00244M


Actual Weight taken =12.04g/dm-3


Moles are killing the flower beds?

Moles are destroying my flower beds leaving air pockets and my flowers are dying. The ground is soft because of all the tunnels. Any advice other than traps? We have the ones that stab them when the mole triggers the trap, but it seems we can't kill them quick enough. I want a better death method. I hate moles. Thanks!!

Moles are killing the flower beds?
I have exactly the same problem, I HATE THEMMMM!!!! they are destroying our new lawn, it's just insane, I can't tell you what works because we tried almost everything and they are still there. I can tell you what doesn't work and maybe I'll save you money... We have that trap that cuts them in half but they are not stupid they already know where it is and don't come near, the cat works, a lot of our neighbor's cats get into our yard and they catch them and eat them but they can only catch one at a time, I tried the pellets and they spit them out of the holes, I tried that chemical that smoke them out and yeah they stop making holes for a day but you find bigger ones the next day, I tried the electronic devices 3 different kinds and none of them worked, I found big mountains of dirt right next to them. Someone told us that there is a plant that makes them go away, but we haven't tried that one yet, we tried the gel that you inject on the ground... didn't work either. I feel ike those cartoons when they are trying to get rid of a mouse and they burned down the house but that ********* gets away. So, if you find something that works for you let me know.
Reply:Hi…I just want to talk with different cultures.i m sorry I couldn’t answer u but if u want to talk with me,my mail s kcicek3005@yahoo.com
Reply:call ABC pet pool and lawn.
Reply:Guy told me that cats can kill moles.





I let the cat out of the house for like 12 hours and the next day I went out there and there was a dead mole on the ground.





There's also those electronic mole repellers and chemical repellents.
Reply:Get Moth Balls and pour in the holes. They'll run from that for sure.
Reply:It's not the most humane way, but I heard putting chewing gum in their hills or tracks will kill them. Apparently they eat the gum but can't digest it. Don't get me wrong though, I love animals. Some just less than others.
Reply:I am a professional mole trapper-where do you live?


In Cleveland Ohio there is another animal-a relative of the mole called a shrew. They are the size of a house mouse and typically they live exclusivly in mulch beds. Moles live in lawns however there are specific moles that will transition from beds to lawn-if you want-contact me @ Nomomoles@aol.com-tell me the city state where you live and I can try to be of assistance. Do not use home remedies or store bought products-the only way to Control them is to trap them out-I know because I have experiemented with everything that makes sence.


It sounds like shrews because the mole harpoon trap did not work-probably because the shrews are too small to activate the trap
Reply:I had them. I bought mole bait at home depot. Find an active tunnel and put some bait in it. After a few weeks, they were all gone.





PS: our dog could hear them and would dig furiously. Of course they would be gone by the time he started digging. So this added to the problem LOL
Reply:Stick a string that has a weak bomb on it then blow it up!


or Take a gun and some one els be at the other end and them have a gun and both of you shoot a ton of times at the same time! Maby that will work.

grappling

Moles from tanning salon?

I have been tanning for about a month...i noticed today these brown spots that look like moles...but the weird thing is they feel like a bump under the skin..i was able to just scratch them off and then it looked like a blackhead but left a small scratch/scar which are healing...is this normal? was it a blackhead or a mole? can some moles just be scratched off? will they come back? will i have scars? they were really tiny just so you know and also how can i prevent this?

Moles from tanning salon?
sometimes they are "sun freckles" but if they're larger, you might want to see a dermatologist. it might be damage to your skin from tanning


moles and blackheads cannot be scratched off.
Reply:OK GREATEST ANSWER EVER GO TO THE DOCTOR OK THE DOCTOR YOU HAVE TO GO TO THE DOCTOR THEY WiLL KNOW WHAT TO TELL YOU THE DOCTOR OK THE DOCTOR GOT iT THE DOCTOR
Reply:I used to tan all the time and that never happened to me......but you might want to go to the doctor and get them checked out. it could also be from your tanning lotion if you use any?
Reply:you shoudl STOP using a tan bed if you are...my mother in law got skin canswer from one.if you really want a tan you should try the spray on!!!
Reply:I would keep an eye on these as (just maybe) you will need a Dr. look at them.


Get a jar of BAG BALM at Walmart.


For sun burn or skin problems to chapped lips it is an all around good thing to have at home.


When a farm animal got caught in wire or had a bad wound=BAG BALM, Same for humans.


How many moles of aspirin, C9H8O4 are present in the 85mg(0.085g) dose recommended for daily heart health?

how many moles of aspirin, C9H8O4 are present in the 85mg(0.085g) dose recommended for daily heart health?


1) 0.00100 moles


2) 0.000470 moles


3) 0.470 moles

How many moles of aspirin, C9H8O4 are present in the 85mg(0.085g) dose recommended for daily heart health?
No of mol = mass / molar mass = 0.085 / 180 = 4.72*10^-4 mol





Answer (2)


How many moles of Fe3O4 can be produced when 6 mol Fe react with 6 mol O2?

a. how many moles of Fe3O4 can be produced when 6 mol Fe react with 6 mol O2?





the answer will be in moles.





b. how many moles of each reactant are left over?


--- I know that Fe disappears, but I'm not sure how to find how many moles of O2 remain.





I would really appreciate it if you would explain how you arrived at the answer. I'm really trying to understand this, but apparently I'm chemistry illiterate.

How many moles of Fe3O4 can be produced when 6 mol Fe react with 6 mol O2?
No one is chemistry illiterate and the fact that you want to understand how this works proves that, in addition, you also correctly state that the Fe disappears; so there you have it.


Now, to your questions:





a. You are asked to figure out how many moles of Fe3O4 is produced when iron and oxygen react. The first thing to do is set up an equation





Fe + O2 -%26gt; Fe3O4





Next, balance the equation





3Fe + 2O2 -%26gt;Fe3O4





Then, check your equation and make sure its balanced. On the left side you have 3 iron atoms (Fe) and 2 oxygen molecules (O2) or 4 oxygen atoms. On the right side you have 3 iron atoms and 4 oxygens atoms. So they balance.





So, the equation is correct (in fact, the reaction is the oxidation of iron to form rust).





Ok, we now know that we need 3 moles of Fe to react with 2 moles of oxygen to form 1 mole of Fe3O4:





3Fe + 2O2 -%26gt;Fe3O4





Now you're given 6 moles of reactants (the iron and oxygen respectively). You need to find out how much of each you actually use in the reaction. This is known as the limiting reagent problem.





So, from the balanced equation above, you try to figure out how much of the product (Fe3O4) your 6 moles of Fe will yield:


6 moles of Fe x (1 mol of Fe3O4 / 3 moles of Fe) = 2 moles of Fe3O4.





Similarly, you try to figure out how much Fe3O4 your 6 moles of O2 will yield. So, 6 moles of O2 x (1 mol Fe3O4 / 2 moles of O2) = 3 moles of Fe3O4.





So you're limiting reagent (the reactant that runs out first) will be the Fe because you can only get 2 moles of your product (Fe3O4) from your original 6 moles of Fe. This answers the (a) part of your question: 2 moles of Fe3O4 can be generated from the use of 6 moles each of Fe and O2 (and, as you stated in your question, the Fe gets used up).





Now, you know that if Fe was not limiting you, you could make 3 moles of Fe3O4 because you have enough oxygen to do so. Oxygen then is the reactant left over; however,since you ARE limited you have 1 mole of Fe3O4 you can't make.





Now, to find out how many moles of oxygen aren't used up you have to work the problem backwards.





1 mole of Fe3O4 could have been made due to excess oxygen but was not because of your limiting amount of Fe:





Using the original equation:


1 mole of Fe3O4 x (2 moles of O2 / 1 mole of Fe3O4) = 2 moles of O2. And 2 moles of O2 is what you have remaining.





Hope that helps, ask if you have any more questions or if I need to make things more clear.





Best Wishes.


Moles / Skin Tags in a strange area...?

I'm a natural red-head, fair skinned and have a lot of moles. All my life I would occasionally get a skin-tag on my neck or back and my doctor would remove them, no problems. I haven't been to a doctor since I noticed these things, but I'm starting to get concerned.





On my bikini line and my upper thigh, only on one side of my body, I've noticed a couple of my "existing" moles are all puffed out like they are growing. And its NASTY!...like I could just pull them off, but I won't/can't. I'm also getting "new" moles around my bikini line and on the top part of my private area. And NO, its not some sort of std. They have been steadily growing and spreading over the last six months or so, but now they are at the size where its completely disgusting and uncomfortable.





I've put on about 25-30 pounds over the last couple years, do you think thats why I'm getting them? Perhaps its hormonal? Or skin cancer, but what a weird spot right?

Moles / Skin Tags in a strange area...?
if they are asymmetrical or different colors then you have to worry. Most of the time they are just skin tags and moles nothing Major just annoying. My mother had a skin tag on her upper thigh that she pulled off when wiping and it bleed. If it is bothersome go to the doctor. Most of the time they clip them off in the office.
Reply:I have a beauty mark/mole on my area. My hubby thinks it's sexy. But if they're spreading and getting bigger I'd definitely see a doctor that way if it is cancerous or precancerous you can safely get them removed.
Reply:umm I think the added pounds could be the tourble,consult a doctor
Reply:no, its not a weird spot your body can get things everywhere you just been lucky to have them around your neck..anyways anytime moles are growing rapidly you need to get it checked
Reply:make sure they aren't warts.
Reply:Its happening cause some of these things are caused by excess skin and viruses are known to cause warts and moles!

yoga

How many moles of potassium ions are present in 1.2 moles of K2SO4?

a. 6.02 x 10^23 moles


b. 0.60 moles


c. 2.4 moles





If you could also explain how you came up with that answer too.


Thanks

How many moles of potassium ions are present in 1.2 moles of K2SO4?
2.4 moles


You have 1.2 moles of K2SO4


Each mole of K2SO4 contains 2 moles of K^+1 and 1 mole of SO4^-2


Substitute "molecule" for "mole" (because 1 mole contains 6.022x10^23 molecules).and it might be easier to see. Perhaps "mole" is what is confusing you.
Reply:Sure. Take a look at the overall molar mass. 158.259 g/mol. Now take a look at the molar mass for K2. It is 78.196 g/mol.





Now set up a proportion,





1.2 mol / 158.259 = x/78.196, cross multiply and solve for x.





x = 0.60,





Your answer is b.


How many moles of oxygen are required to burn 34.2 g of methyl alcohol?

The methyl alcohol, CH3OH(l), used in alcohol burners combines with oxygen gas to form carbon dioxide and water.


How many moles of oxygen are required to burn 34.2 g of methyl alcohol?





Our teacher requires us to show work(step 0: balanced equation, 1: grams-moles, 2: mole ratio and 3: moles: to grams so plz. include steps if you can. thanks

How many moles of oxygen are required to burn 34.2 g of methyl alcohol?
2CH3OH + 3O2 --%26gt; 2CO2 + 4H2O


molar ratio O2 to CH3OH = 3:2


34.2g / 32.04 g/mol = 1.067 mol CH3OH


1.067 mol x (3/2) = 1.60 mol O2
Reply:Step 0: 2CH3OH (l) + 3O2 (g) --%26gt; 2CO2 (g) + 4H2O (l)





34.2g of methyl alcohol is 1.07 moles of methyl alcohol (I got that by dividing the mass by the GFM of CH3OH which is 32.05).





By looking at the balanced equation, every 2 moles of CH3OH takes 3 moles of O2 (g). So, if there are 1.07 mol CH3OH, there would be (1.07 x 3/2)mol O2 (g), which is 1.60mol O2(g).





Answer: 1.60mol or 51.2g of O2.





Here's the stoichiometry (contains steps 1-3 in brackets):


[34.2g * 1mol / 32.05g] * [3mol / 2mol] * [32.00g / 1mol]


= 51.2g of O2.

ivy

Moles of chlorine found in 3.50 moles of aluminum ..?

can u please calculate the number of moles of chlorine atoms found in 3.50 moles of aluminum chlorate. and if u can show me how u did it. (and if there is a good link or sourse i can use that would be great! and thanx A LOTTTTT!!

Moles of chlorine found in 3.50 moles of aluminum ..?
First, write out the molecular formula: Al[ClO3(-)]3


(This step is easy if you know your polyatmic ions.)


Then, reason that for every 1mol of Al[ClO3(-)]3, you have 3mols of Cl (since there is a parenthesis around chlorate followed by a 3). The key is the factor label method, I will show you the work done out.





3.50 mol aluminum chlorate x (3mol of Cl)/(1mol of aluminum chlorate)





hint: when you reason through this problem, for every one mol of aluminum chlorate, you have 1mol of Al, 3mol of Cl and 9 mol of oxygn. Use these as conversion factors the separate the individual unit from the molecular formula. Hope this helps!


Moles of limiting reactant?

Hi there,


I'm wondering how to determine what compound/element is the limiting reactant in a chemical reaction. I'm not asking for answers, but I'm asking for an explanation. For example, if I have a problem which states that I have 2.5 moles of copper and 5.50 moles of silver. Is copper is the limiting reactant, because there's less of it? Or is there a method to determine this? How can I determine the moles of the excess reactant? Any help will be greatly appreciated. Thanks!

Moles of limiting reactant?
You need to use stoichiometry to find out how many moles of the product you have. You can pick any product but if one product is water it would best not to pick that.


So you would go from moles of copper to moles of a product and then a seperate problem to go from moles of silver to moles of the same product.


Whichever reactant creates the least amount of product is your limiting reactant.
Reply:The limiting reactant is the reactant which is consumed first. So yes, once you have carried out the reaction, you use stoichiometry to determine the moles or grams of the amounts of the products that are left. Whatever one is smaller is the limiting reactant because it limits the amount of product that can be formed.
Reply:Try and set up a ratio between the moles of silver and the moles of copper. It would really help to have a balanced equation, but I'll make one up and show you.





2 AgCl +CuSO4 - - - CuCl2 + Ag2SO4





Set up a ratio. I have 2.5 moles of copper, so . . .





2.5 mol copper X 2 mol silver/1 mol copper (because I have two moles of silver for every 1 mole of copper.)





I would need 5 moles of silver to complete this reaction. I have 5.5, so the copper is my limiting reactant.





Hope that helped!
Reply:Hello!


okay firstly, u can't determine which is the limiting or the excess just by looking at the number of moles of reactant. Because, in a chemical reaction, it is not always that the reactants are in the ratio 1:1.





For eg, in the reaction of say, hydrogen and oxygen to produce water:





2H2 + O2 ---%26gt; 2 H2O





as you can see, in a balanced equation as such, 2 units of hydrogen are required to react with 1 unit of oxygen.





Hence, if 4 moles of H2 and 2 moles of O2 are available, there will be no excess/limiting reactant because the reactants are in the correct ratio.





However, if 5 moles of H2 and 2 moles of O2 are available,


the O2 becomes the LIMITING FACTOR because 2.5 moles of O2 are required to react with 5 moles of H2. and the H2 is now in EXCESS.





The number of moles of the excess reactant will be 5 moles. And the number of moles of the reactant that is in excess, (not participating in the reaction and will be left over in the products) is hence 1 mole of H2.





get it?





:D


Moles --> Grams and Grams --> Moles problems?

I am studying how to figure out how many moles are in a certain mass of a substance and how many grams in a certain amount of moles. Could you post some practice problems that I could work on?

Moles --%26gt; Grams and Grams --%26gt; Moles problems?
There's a couple of practice questions at the end..





...A 'Mole' of a compound is defined as "The number of grams (or other weight (mass) unit of the compound that is equal to its Molecular weight (Mass)".


...A mole may be called 'Gram-mole'; 'Lb-mole'; 'Kilo-mole' ..etc.


...e.g. The Mol. Wt. of water (H2O) = 2 + 16 = 18.


...18 grams of water is called 1 g-mole or 18 lbs of water is called 1 lb-mole.





...From this we can calculate the number of 'Kilo-moles'in 900 kg of water.


...Divide the number of Kg by the mol.wt.


...= 900 ÷ 18 = 50 kilo-moles of water.


...A mole is represented by the formula of the compound. e.g. water, H2O = 1 mole of water.


...To show more than 1 mole, a number is placed in front of the formula. e.g. 3H2O = 3 moles of water.


...Example: Take 20 lb of NaCl; Mol.wt of NaCl = 23 + 35 = 58.


...Number of moles of NaCl = 20 lb ÷ 58 lb-mole = 0.345 lb-mole.





Try these examples: -


... How many Kilo-moles in 12 kg of CO2 ?


...Ans: CO2 = Mol.wt. = ?


.........= ? 0.273 kg-mole.


...How many Gram-moles in 24g of H2SO4 ?


...Ans: H2SO4 = Mol.wt. = ?


........... ? = 0.245 g-mole.


...Now:Make up some for yourself.
Reply:1. What is the mass of 0.25 moles of CO2?





2. How many moles of methane are there in 320g of CH4?





3. What is the mass of 5 moles of ammonium sulphate, (NH4)2SO4?





4, How many moles of sodium chloride are there in 175.5g of NaCl?


You have any moles in your yard lol?

A family of moles had been hibernating all winter. One beautiful spring morning, they woke up. The father mole stuck his head out of the hole and looked around. "Mother Mole!" He called back down the hole. "Come up here! I smell honey, fresh made honey!" The mother mole ran up and squeezed in next to him. "That's not honey, that's maple syrup! I smell maple syrup!" The baby mole, still down in the hole, was sulking. "I can't smell anything down here but molasses ..."

You have any moles in your yard lol?
thats so funny! i have lots of moles in my yard! i will think of this joke when spring comes and im tripping over them!!!
Reply:Ha ha ha ha ha. Thats great.
Reply:hhahaah


lol
Reply:hahahahahaha!!! Every single one makes me feel that little bit better!





Thanks!
Reply:Hahahaha! lol
Reply:i don't get it?


how can molasses syrup aka Sweet sorghum be funnY?????
Reply:lol. thanks for the smile. it was great.
Reply:PMSL! xD





Have a star! *
Reply:lol Cute!
Reply:LOL LOL Really cute. Love it !!!
Reply:Hahaha! That was a really good one, lol!
Reply:Holy Moley.....great punch line! Loved it! ;%26gt;)


)-(
Reply:lol cute but dirty =)
Reply:lol thats funny . just what i needed on this rainy hump day .

fuchsia

How many moles of LiCl are contained in a LiCl pellet with a mass of 5.035 grams?

15.00 moles


0.067 moles


42.39 moles


0.1188 moles

How many moles of LiCl are contained in a LiCl pellet with a mass of 5.035 grams?
42


Freckles and moles?

freckles and moles why do you think that girls get more freckles and moles on their arms then med tell me what your think and tell me about your if you have freckles and moles on your arms how Meany do you have on your arms were about are they on your arms what do they look and what color are the freckles and moles on your arms

Freckles and moles?
Do you have a secret freckle fetish?
Reply:if ur questioning wat they should look like, they look like regular freckles.. IF ur moles look weird it might be skin cancer from the sun
Reply:im a girl and on one arm i have 19 freckley/moles . xx
Reply:i have a lot of freckles on my arms and a couple moles. my moles just look like freckles but are slighlty raised. they are all the same shade of a burnt orange color.


Moles again does this too make sense?

average : 13.69mL


calculate total moles of Mg2+ AND CA2+ in 10mL hard water





option 1: 13.65/1000=0.001365L x 0.01 M EDTA= 1.365x10^-5


or


option 2: the same as above but include my calcium moles


and multiple it by my Ca2+ moles?

Moles again does this too make sense?
I think that this is right
Reply:now they are startin with the Chem porn, Math porn wasn't enough


How many moles of phsophorus, oxygen and calcium atoms are contained in 1/2 a mole of Ca3(PO4)2?

I said:


1.5 moles of Ca


1 mole of P


4 moles of O





Am I right?

How many moles of phsophorus, oxygen and calcium atoms are contained in 1/2 a mole of Ca3(PO4)2?
Yes , you are right





3 atomes of Ca by molecule


so in 0.5 mole --%26gt;3*0.5 = 1.5 mole Ca





2 atomes of P by molecule


so in 0.5 mole --%26gt;2*0.5 = 1.mole P





8 atomes of O by molecule


so in 0.5 mole --%26gt;8*0.5 = 2 moles O
Reply:1mol Ca3(PO4)2





3 atoms Ca You are going to multiply the amount of atoms by


2 atoms P 1/2 because since there is 1 mol of the whole


8 atoms O compound, or you could to divide them by 1/2 :)





3/1 x 1/2 = 3/2 or 1.5


2/1 x 1/x = 1/1 or 1


8/1 x 1/2 = 8/2 or 4

paper bush

MOLES! moles! MOLES!?

Is there any kind of makeup that can cover up small flat moles on my face without looking fake?

MOLES! moles! MOLES!?
hope u get good answers cuz even i have the same problem
Reply:Hello,





Well there are make-up but it isn't cheap, though.
Reply:Try one of the mineral powers - I really like Jane Iredale. It covers the reddness from rosacea very well. It is about $30/jar - but one jar lasted me over 2 years.
Reply:Try Dermablend. It's avail at Ulta %26amp; most upscale dept stores, it also covers bruising, red birthmarks and tattoos.
Reply:light foundation, or concealer and foundation, with little or no powder since powder will cake around it.





be sure to check them once a month for any changes in shape or coloring.


How do I find how many moles of hydrogen atoms...?

1: How many moles of hydrogen atoms are there in:


a) 1.60 moles of zinc hydroxide


b) 0.20 moles of sodium hydrogenphosphate-12-water





Also, how do I find the mass of the following samples?


a) 2.65 moles of phosphoric acid, H3PO4





b) 0.0080 moles of mercury (II) iodide





c) 1.60 moles of yellow phosphorous, P4





Please help me. Thankyou.


c) 0.350 moles of ammonium hydrogensulfate





Note: How do I do this...please explain it all to me and show working so that I know how to do these. Do I need to know the formula for these 1st question ones? Please help me.

How do I find how many moles of hydrogen atoms...?
moles=grams/atomic mass





atomic mass of H is about 1 so one gram equals one mole. Thats only for H though
Reply:You MUST know the formulas to answer Q1.


a. The compound is Zn(OH)2.


Since hydrogen appears as H2, 1 mole of hydrogen supplies 2 g-atoms. In this case, you HAVE 2 g-atoms in the hydroxide, so there is one mole of H2 per 1 mole of the compound. Ans=1.6


b. The compound is Na H2PO4 (phosphoric acid has 3 ionizable hydrogens, and thus with a anion like sodium can form 3 different compounds.


Here you again have 2-atoms of the hydroxide


per mole of the compound. So Ans= 0.20


c. The compound is NH4 HSO4 . Each mole of this contains 5 g-atoms of H. So the moles in each mole is 2.5. Ans= 0.875 moles.





For your masses, you need mole weights and to know the atomic numbers of the component elements


For H3PO4, mass = 3(mass H)+ 1(mass P) + 4(mass O). The masses are 1, 35 and 16 respectively, so the answer would be 102g/mole


So multiply this by 2.65 to get mass.





The compound is HgI2.


The mass is (if I have my numbers right) is


198+2(127)= 452


Multiply by 0.008 to get mass





For P4 mass= 4P or 140. Mult by 1.6 to get answer.
Reply:1. a) 1.60 mol Zn(OH)2, 1 mol Zn(OH)2 = 2 mol H


1.60 mol Zn(OH)2 x (2mol H/1mol Zn(OH)2 )


= 3.20 mol H


b) NaH2PO4.12H2O


0.20 mol NaH2PO4.12H2O x (26 mole H/ 1mol NaH2PO4.12H2O) =5.2 mol H





2. a) 2.60 mol H3PO4 x (98.0 g/mol)=254.8=255 g


b) 0.0080 mol HgI2 x (454.4g/mol) =3.6 g


c) 1.60 mol P4 x(124g/mol)=198g


3. 0.350 mol NH4HSO4 x (115g/mol)=40.3 g
Reply:the first answer is 1.6;





[1.6 moles Zn(OH)2] TIMES [2 mol OH/1 mol Zn(OH)2] TIMES [1 mol H/2 mol OH] = 1.6 mol H2





the equations i used for that: Zn + (OH)2 --%26gt; Zn(OH)2





and: H2 + 2O --%26gt; (OH)2





remember: hydrogen is diatomic. when isolated, it only comes as H2. that is the reason why the answer can't be 3.2 grams H


Moles on your skin!?

Yeah this morning i just noticed a small mole on my neck. It seriously ruins my look. Is there anyway to prevent moles or remove them? Also as funny as it sounds do you think the mole just appeared there over night? i never really noticed it.

Moles on your skin!?
Hi Nick





Here are some answers.





Cause


Warts and moles are usually the result of a nutritional deficiency and they should be treated internally, as well as externally.


Potassium deficiency.





1.General Information for Warts and Moles: The warts, moles and skin blemishes are helped externally and are often cleared up by using the white milk from dandelions and/or from milkweed. Applying castor oil or garlic oil to the area several times a day and taping a piece of gauze soaked with this oil over the wart during the night will aid in clearing the condition. The use of a clove of garlic cut in half (or mashed or grated) and kept over the wart all night until it is gone has aided many. Black walnut tincture and the following combination tincture have been used with such success that a number of people swear by them. The combination tinctures consists of blue vervain, black cohosh, blue cohosh, skullcap and lobelia herbs in equal parts, using 90 proof or stronger alcohol as a base.





2.More General Information for Warts and Moles: Use the mucusless diet and add plenty of raw carrots, kelp, dulse, or sea weed and onions to the diet.








3.Garlic for Warts and Moles: Here is a very successful routine for removal of these unwanted growths called moles, or warts. Take a button of garlic, slice or cut in two, and placed the cup area over a wart of mole. Tape it on, and as it dries out put a fresh piece. Many users have reported good results.





4.Potassium Deficiency for Warts and Moles: When cysts or tumors grow in places where they can be seen outside the body, often we react by having them cut out. This defeats healing by working on the effect instead of the cause. You can cut cysts out, tumors off, and burn warts off (which are also a potassium deficiency), or get rid of as many moles as you wish, but unless you go to the cause, they will grow back again, and you may end up with as many or more cysts, tumors, moles as before. Different signs of potassium deficiency will keep popping out on the body because the condition that needs correcting is on the inside. You have to go into the cause, Dr. Christopher always insisted, which is the way we have been eating.Potassium sources: There are several ways to receive your potassium. Dr. Bernard Jensen sells a potassium broth made from dehydrated vegetables. Dr. Bronner makes a similar, excellent product. You can also make your own potassium broth by simmering equal parts of red potatoes, celery, carrots, onions, and herbs to taste. Raw vegetable and fruit juices also flood the system with potassium.





Best of health to you
Reply:if mole out of sudden appear it mean there are toxin in the body. just go to beautician and they will either put a kind of cream or use laser to remove the mole.
Reply:1...take homeopathy medicin, go to health food store ask for THUJA..this is a special cure for moles





2 go to indo Pakistani grocery stores .ask for KALONJI or KALVANJI.....these are onion seeds..no taste.


every morning swallow a pinch with water. mole will dry
Reply:You can go to a dermatologist and have them frozen off or cut off. These are both simple I have had it done. It can be a little sore afterwards, but having mine removed was worth it.


Lot of Moles on the Face, How to get rid of them?

I have lot of moles ( black ) on my face, but on the area on which i shave it is on upper side of cheeks , nose and forehead and yeah on body but not that much like on face( approx 250 moles on face). I have very fair color and soft and smooth skin probably sensitive too.How i get rid of these moles . I have changed my eating habits , took lots of fresh fruits and fiber but no cure. Please tell me.I went to doctor too but he suggested some cleanser or lotion( which i have to applied where i have moles on my face) which wiped out my original skin color at one place and i quit using it. so will you ppl guide me?

Lot of Moles on the Face, How to get rid of them?
1st make sure they are moles.if yes consult a doctor and if they are pimples or blackheads then i can help you.on my personal experience i can say do not use chemicals on ur face.my doctor advised me some lotions and ointment and today my skin is as dead as a coconut shell.instead take a lot of water and avoid using creams.use some good face wash and apply home made face packs like apply honey and baesan.wash your face regularly and if u also have scars left on your face apply coconut oil.it might help you.it did help me.
Reply:Your only option may be to have them surgically removed, if these are indeed moles. If these are blackheads, simply boil a pot of water and 'steam' your face for about 20 mins. The blackheads will become soft and can be scrubbed or squeezed out. I hope this helps
Reply:You need see Skin Doctor

daphne

Moles Moles Moles?

I am a female.......and getting older....I have been getting Moles on my stomach and a few other places? I feel like maybe they are from a Tanning Bed....anyway...they are about a dime size.....and are raised above the skin a little. What can I get to remove them, something over the counter.....They are med brown in color and no hair growing out of them! any Ideas...................................... hate the way the look! :0(


Barbie

Moles Moles Moles?
Treatment for moles:





If your doctor takes a tissue sample of the mole and finds it to be cancerous, the entire mole and a margin of normal tissue around it needs to be removed. Usually a mole that has been removed won't reappear. If it does, see your doctor promptly.





Treatment of most moles usually isn't necessary. For cosmetic reasons, a mole can be removed in several ways:





Shave excision. In this method, your doctor numbs the area around a mole and then uses a small blade to shave off the mole close to your skin.





Punch biopsy. Your doctor may remove a mole with a small incision or punch biopsy technique, which uses a small cookie-cutter-like device.





Excisional surgery. In this method, your doctor cuts out the mole and a surrounding margin of healthy skin.


These procedures are usually performed in the office of your doctor or dermatologist and take only a short time.





=)
Reply:ewww....lol j/k you can get them surgically removed.
Reply:Go to a dermatologist and get them checked out.
Reply:Yeah, you should get them checked out by the dermatologist to see if you may have skin cancer.
Reply:My sister's dermatologist told her that there is a gene for the formation of moles. Some people have the gene and are prone to have more moles on their body. She has the gene and I don't. Her skin is a little "pinker" than mine - I have more gold undertones, although I am very fair, like her.





You need to be very careful about skin cancer formation. I would ask your doctor to refer you to a dermatologist. If the moles look dangerous, the dermatologist may remove them and your health insurance would cover the cost. Otherwise, you would have to pay out-of pocket since it is considered cosmetic surgery. Please don't try to remove them yourself.





Good luck to you and please take care of your health!