Saturday, April 24, 2010

How many moles of iron, Fe, can be made from Fe2 O3 by the use of 18 moles of carbon monoxide, CO, in the ....

How many moles of iron, Fe, can be made from Fe2 O3 by the use of 18 moles of carbon monoxide, CO, in the following reaction?





Fe2 O3+3 CO--------------- 2 Fe+3 CO2

How many moles of iron, Fe, can be made from Fe2 O3 by the use of 18 moles of carbon monoxide, CO, in the ....
3 moles of CO react with 1 mole of Fe203 to yield 2 moles of Fe





18 moles of C0 react with 6 mols of Fe2O3 to yield 12 moles of Fe





Thierry


How many moles of Hydrogen are needed in order to produce 4 moles of ammonia?

According to the following reaction, how many moles of hydrogen are needed in order to produce 4 moles of ammonia? 3 H2 (g) + N2 (g) ----%26gt; 2 NH3 (g)

How many moles of Hydrogen are needed in order to produce 4 moles of ammonia?
6 moles of Hydrogen


2 moles of Nitrogen


Radioactive Decay - Moles?

Palladium-107 undergoes Beta decay (half-life=6.5E5 yrs.) to form Silver-107. How long will it take for .150 moles of Ag-107 to form from 1.25 moles of Pd-107?





Correct Answer: 1.2E5 yrs





Any idea on how I'd go about doing this? I've tried plugging the moles directly into the formula:





ln(Ao/At)=kt, but I keep getting the wrong answer...





Thanks!

Radioactive Decay - Moles?
You used the natural logarithm.


Then k is 1 /relaxation time.


If you use base 10 you can use k = 1 / half life





Th

night jasmine

How many moles are prepared from????

How many moles of P4S10 can be prepared from 0.25 moles of P4 and 0.25 moles of S8?


There are no other reactants or products.

How many moles are prepared from????
0.2





.25 moles * 8/10


you need 10 atoms of S in the product. The reactant has only 8, so for every .25 moles of S8, you will get .25 * 8/10 of reactant.
Reply:4P4 + 5S8 --%26gt; 4P4S10





You need 5 moles of S8 to react with 4 moles of S4


S8 is the limiting reagent.





0.25 moles S8 x (4/5) = 0.20 moles of P4S10


How many moles of ions are one mole of Ca(OH)2?

the questions starts with: the ions present in Ca(OH)2 are Ca2+ and OH -.





the second part of the questions is how many moles of electrons are in 1 mole of OH minus ions.





Please show me how u did it and what it is that you are doing. THank you very much. Use the above info to answer the question.

How many moles of ions are one mole of Ca(OH)2?
Ca(OH)2 --%26gt; Ca^2+ + 2OH-





From 1 mol of Ca(OH)2, 1 mol of Ca^2+ ions and 2 mol OH- ions are produced, for a total of 3 mol ions.





1 mol OH- has 1 mol electrons, if we're only counting the electron that gives rise to the charge. If we're counting total electrons in OH-, then O has 8, H has 1, and there is 1 electron giving the charge, for a total of 10 electrons in OH-.


Then 1 mol OH- has 10 moles of electrons.


Atoms and moles -Chem- EASY BEST ANSWER!!?

Hello does anyone know the answer to these problems because it'll earn best answer. my answers were wrong.








How many atoms of hydrogen are contained in 100g of methane (CH4)


My Answer: There are 25 atoms of Hydrogen in 100 grams of methane.


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~...


How many moles of P4O10 are produced when we react 8 moles of phosphorous with oxygen?


My Answer: 1.6 Moles

Atoms and moles -Chem- EASY BEST ANSWER!!?
I have checked all of your last questions and saw that all of them are in the same type:


"Mole - Mass - Number of Particles" relationship.





Therefore, rather that to give individual answers, it will be better to teach the concept so that you can solve the questions of the same type.


-----------------------------


Elements have "symbols" and compounds have " formulas". The symbol of an element or the formula of a compound represents their one mole.





For example;


- H2O = 1 mol water, in which 1 mol O and 2 mol H are present.


- NH3 = 1 mol ammonia, in which 1 mol N and 3 mol H are present.





In a chemical equation;


- N2 + 3H2 ------%26gt; 2NH3


1 mol nitrogen (N2) reacts with 3 moles hydrogen (H2) and produces 2 moles of ammonia (NH3).





Now, the number of particles:


1 mole always represents a specific number, called Avogadro's number that is 6.02 x 10^23.





For an element:


1 mole of any element contains Avogadro's number of "atoms" of that element.


1 mol Fe = 6.02 x 10^23 Fe atoms


1 mol Mg = 6.02 x 10^23 Mg atoms.





For a compound:


1 mole of any molecular (covalent) compound contains Avogadro's number of "molecules" of that compound.


1 mol NH3 = 6.02 x 10^23 NH3 molecules.


1 mol H2O = 6.02 x 10^23 H2O molecules.





1 mole of any ionic compound contains Avogadro's number of "formula units" of that compound.


1 mol NaCl = 6.02 x 10^23 NaCl formula units.


1 mol CaO = 6.02 x 10^23 CaO formula units.





Now, we have come to the mass relationship:





The mass of 1 mole of any element is numerically equal to its atomic mass expressed in grams.


For example; atomic mass of Fe is 56. If you have 56 g of iron, this means that you have 1 mole of iron.


Atomic mass of sodium is 23. So, 23 g Na = 1 mole.





If you combine the number of particles, you get 3 relationship:


1 mol Fe = 56 g = 6.02 x 10^23 atoms of Fe


1 mol Na = 23 g = 6.02 x 10^23 atoms of Na


1 mol Mg = 24 g = 6.02 x 10^23 atoms of Mg





The mass of 1 mole of any compound is numerically equal to its formula mass expressed in grams. For example;





H2SO4 formula stands for 1 mol sulfuric acid, in which there are 2 moles of H, 1 mole of S and 4 moles of O. Their atomic masses are 1, 32 and 16 respectively. Therefore, the formula


mass of H2SO4 : (2x1) + 32 + (4x16) = 2 + 32 + 64 = 98





If you have 98 g of H2SO4, this means that you have 1 mole of H2SO4.





Now, lets apply what we have learnt to your questions.





(1) The formula mass of methane (CH4) = 12 + 1x4 = 16


This means that 16 g of CH4 = 1 mole or in other words,


the molar mass of CH4 = 16 g/mol.


16 g CH4 = 1 mol and it contains 4 moles of H atom


then, 100 g CH4 will contain;


4 mol H x (100 g CH4 / 16 g CH4) = 25 mol H atom.


But the question requires "the number of atoms".


1 mole of any element has Avogadro's number of atoms, therefore;


25 mol H x 6.02x10^23 atom/mol = 150.5x10^23


= 1.505x10^25 atom H





(2) Although the question implies a reaction, there is no need to write an equation of the reaction.


The formula of P4O10 states that you will need 4 mol P and 10 mol O to make 1 mol P4O10.


In this question the limiting substance is P (its amount is specified).


Since 4 mol P produces 1 mol P4O10


8 mol P produces (P is doubled, P4O10 is also doubled) 2 mol P4O10. Or,


1 mol P4O10 x (8 mol P / 4 mol P) = 2 mol P4O10.





I think, it is clear and I believe that you can solve your other questions. If not, please inform me. Since you are not one of my contacts, from time to time I look at your profile page to investigate your new questions. Because in answering the questions, the priority is given to those who appreciate my answers.
Reply:25 is the amount of grams of hydrogen, not atoms. Convert 25g of hydrogen to moles, then to atoms using avagrados number. The answer should be 1.49 times 10 to the 24 atoms.
Reply:A lot more hydrogen's than that!





100g CH4 X 1mol/48.42g X 4mol H/1mol C X 6.022 X 10^23





= 4.97 X 10^24 atoms of hydrogen.





Need balanced equation for 2.


How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide?

Aluminum oxide is formed from the reaction of metallic aluminum with oxygen gas. How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide? This is a simple ratio problem. Mass is not involved.

How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide?
The formula for aluminium oxide is Al2O3 (you can just google the term if you want to know the chemical formula for a compound). If you wanted one molecule of Al2O3, you would obviously need two atoms of aluminium. So, if you want 3.4 moles of Al2O3, you would need twice as many moles of aluminium.

frangipni

Are freckles/moles really beauty marks?

if a woman has many freckles or moles on her face (i don't mean the big, ugly disgusting, wart-looking moles) but just little dots on her face, does this mean she is pretty? Do a lot of dots on your face symbolize beauty? I notice a lot of pretty girls with freckles and moles, but is this true or just a myth? Are they really "beauty" marks?

Are freckles/moles really beauty marks?
it doesn't really mean they are guaranteed to be pretty.





but the name beauty mark sounds alot prettier then "mole" or "freckles" people just prefer to call it that because it sounds nicer.





there are plenty of beautiful girls without "beauty marks" and there are also beautiful girls with them. but it is generally not the freckle or mole that makes them beautiful or pretty.
Reply:No, they are cancer.
Reply:first little spots on the chiks as a kid i would say hot dut *** you get older they go awaya so im not shere i have a lot of freakels
Reply:well me i dont think thats luks pretty the only kind of frecklethat i think luks nice is a small one like right n top of ur upper lip n the right or left side corner
Reply:Beauty spots are accepted depending on the culture or the society you live in.


If you have a pretty or loveable face, a spot or a mark will not disfigure it.


Some times a spot can highlight a feature in your face and attract other people to admire that feature and eventually come to think “ people are cute with beauty spots”





Freckles or moles can also indicate early skin abnormalities which maybe symptoms of other diseases, cancer or even that you are expose to pollution or too much sun.





Its always wise to show it to your docter for consultaion.
Reply:Most moles are hereditary and those that you were not born with may be a result of sun exposure. Like freckles, it is believed that moles can form due to overexposure to sunlight. Moles that have been viewed as beauty marks have been appreciated for many centuries and in many parts of the world. Women have, for a long time, used makeup to apply faux beauty marks. Typically, moles that are known as beauty marks are located on the face. The most famous recent moles belong to Cindy Crawford, Madonna, and, my personal favorite, Enrique Iglesias. As far as America's appreciation for the beauty mark goes, you can attribute it all to the iconic Marilyn Monroe.


How many moles of H2O are produced from the complete reaction of 5.24 moles of CH4 ?

For the reaction








CH4 + O2 → CO2 + H2O








how many moles of H2O are produced from the complete reaction of 5.24 moles of CH4 ?

How many moles of H2O are produced from the complete reaction of 5.24 moles of CH4 ?
10.48 mols





since CH4 + O2 → CO2 + 2H2O





ie 1 mole CH4 produces 2 moles H2O





Therefore 5.24 mols CH4 produces 10.48 mols H2O
Reply:i really don't know...


How many moles of copper (II) nitrate are required to produce at least .50 moles of either N dioxide or O gas?

copper (II) nitrate decomposes upon heating to form copper (II) oxide, nitrogen dioxide gas, and oxygen gas. How many moles of copper (II) nitrate are required to produce at least .50 moles of either nitrogen dioxide or oxygen gas?








a. .50


b. 4.0


c. 2.0


d. .25


e. 1.0








show how you got it!

How many moles of copper (II) nitrate are required to produce at least .50 moles of either N dioxide or O gas?
First write equation:





Cu(NO3)2 --%26gt; NO2 + O2 + CuO





Balance Equation





2Cu(NO3)2 --%26gt; 4NO2 + O2 + 2CuO





From balanced Equation, O2 is limiting reagent.


So find amount of Cu(NO3)2 required to produce 0.5mol of O2 using dimensional analysis.





0.5mol O2 × 2 mol Cu(NO3)2 = 1 mol Cu(NO3)2 required. [E]


1 mol O2
Reply:2Cu(NO3)2 → 2CuO + 4NO2 + O2





2 mole of Cu(NO3)2 =%26gt; 2 mole of Cu, 4 moles of N, 12 moles of O





which would make 2xCuO+4xNO2+O2





the reason we have to take 2 moles in the beginning is to make sure we have O2 at the end.





So, it seems that the amount of O2 and the amount of NO2 are different at the end. if you want 0.5 moles of O2, you need 1 mole of Cu(NO2)3, if you yant 0.5 moles of NO2, you need 0.25 moles of Cu(NO2)3.





check the link:


How many moles of ions are present when .10 moles of the following compounds are dissolved in WATER?

How many moles of ions are present when .10 moles of the following compounds are dissolved in WATER?





A). K2SO4





B). Fe(NO3)3





C). Al2(SO4)3








D). NiSO4








Any help what so ever would be appreciated. Thanks!

How many moles of ions are present when .10 moles of the following compounds are dissolved in WATER?
a. 2k+ = .20moles , SO42-=.10moles





b.Fe3+=.10moles,3NO3-= .30moles





c.2Al3+=.20moles,3SO42-=.30moles





d. Ni2+=.10moles,SO42-=.10moles
Reply:Taking that what all of the salts form ions completely the following will happen





K2SO4 -%26gt; 2K+ + [SO4]2- = 3 ions so 3 x 0.1 = 0.3 moles


Fe(NO3)3 -%26gt; Fe3+ + 3[NO2]- = 4 ions so 4 x 0.1 = 0.4 moles


Al2(SO4)3 -%26gt; 2Al3+ + 3[SO4]2- = 5 ions so 5 x 0.1 = 0.5 moles


NiSO4 -%26gt; Ni2+ + [SO4]2- = 2 ions so 2 x 0.1 = 0.2 moles

bleeding heart

How many moles of ions are present when .10 moles of the following compounds are dissolved inwater?Please help

How many moles of ions are present when .10 moles of the following compounds are dissolved in WATER?





A). K2SO4





B). Fe(NO3)3





C). Al2(SO4)3








D). NiSO4








Any help what so ever would be appreciated. Thanks!

How many moles of ions are present when .10 moles of the following compounds are dissolved inwater?Please help
a 30


b 40


c 50


d 20
Reply:it depends what volume of water you have then u can use the equation n=CxV and n= m/M





where n = number of moles


c = concentration (.10 moles)


v = Volume of water


m = mass of compound used


M = molar mass of each compound





Good luck


Can you help me determine moles of a product?

Using the following balanced reaction, determine how many moles of hydrogen gas (H2) are produced from 5.00 g Na:


2Na + 2H(subscript 2)O ---------2NaOH +H(subscript 2)


a. 2.5 moles


b. 0.109 moles


c. 0.217 moles


d. 0.435 moles


e. not enough information





Thank you

Can you help me determine moles of a product?
the answer is a) 0.109 mole





first you have to find number of moles. since you are given the mass of Na,





no of moles of Na = 5/23


= 0.21739





from the equation, (no of moles of H2) / (no of moles of Na) = 1/2





so therefore, no of moles of H2 = 1/2 x 0.21739


= 0.1086


= 0.109 moles (3sf)





hope this helps! :D


How many moles in a gram of solution/liquid?

Is there a mole in every gram of solution? or is there another way of weighing how many moles in a solution/liquid?


I need 0.083 moles of water, how much is that in centimeters or grams?

How many moles in a gram of solution/liquid?
No, there is not a mole in every gram of solution. It all depends on the molecular weight, which depends on the identity of the elements involved.





Water's molecular weight is 18 g/mole, so 0.083 moles of water would weigh 1.49 grams. Given water's density is roughly 1 g/ml, that would also be 1.49 ml or 1.49 cm^3.
Reply:Isn't 1 mole 1 kg in 1 litre of solution?





I can't remember -- but you should see the damage just a single mole did to my lawn last year!





(PS as is probably evident I was rubbish at Chem..and now TheOnlyBeldin has made me feel quite stupid...I'll stick to subjects I feel happier with in future)
Reply:mole in the hole
Reply:You need .083 moles of water?





(.083 moles H2O) (18 grams H2O/ mol of H2O) = (Moles cancel out) 1.49 grams H2O





If you want a molar concentration of .083 M, that's different...
Reply:Actually.no. of moles=weight/mol.weight


therefore,weight=moles into*18


=0.083*18


=1.494 g


How many moles of Fe2+ can be oxidized by 0.043 moles MnO4-?

the redox reaction that i balanced was:


2Mno4- + 5HC2O4- + 11H+ --%26gt; 2Mn2+ + 8H2O + 10CO2


i got as far as converting the moles of MnO4- to grams; is that even nescesary? or would i just use the the ration to find the moles of Fe2+? could someone please help? thanks!

How many moles of Fe2+ can be oxidized by 0.043 moles MnO4-?
The equation is not this ( where is Fe2+? )





but it is :





8H+ + MnO4- + 5Fe2+ %26gt;%26gt; Mn2+ + 5Fe3+ +4H2O





the ratio between MnO4- and Fe2+ is 1 : 5





1 : 5 = 0.043 : x





x = 0.215 moles Fe2+ that can be oxidized
Reply:You don't need grams, just the ratio. MnO4- has room for 5 electrons. Depending on what's happening to your iron, and I suspect it's going from 2+ to 3+ (You gave the wrong equation); if so, you can oxidixe 5 times your .043 moles as each mole of permanganate can oxidize on Fe2+ to Fe3+.

street fighting

Calculate the moles?

Calculate the moles of iron (III) chloride used. The concentration was 0.400 g/ml.


I know how to calculate grams to moles..but i dont understand using g/ml


should i just forget about ml and change it to moles?


please help.ty

Calculate the moles?
You would need to know the volume of the iron (III) chloride solution used. If you multiply the volume by the concentration, then you will know the number of grams. Then you can convert to moles using the molecular weight.
Reply:You do have a units problem. You need a volume to calculate a mass from density [g/ml].


mass g = volume ml * density g/ml


How many moles of oxygen are produced per day for one person who requires the emergency breathing device?

Sodium peroxide is sometimes used in emergency breathing devices on submarines since the compound will react with carbon dioxide to produce oxygen and sodium carbonate. Answer the following questions if we assume that one person produces about 10.0 moles of carbon dioxide in a 24 hour period.





2Na2O2(s) + 2CO2(g)  2Na2CO3(s) + O2(g)





How many moles of oxygen are produced per day for one person who requires the emergency breathing device?





How many grams of sodium peroxide are required to remove 10.0 moles of carbon dioxide?

How many moles of oxygen are produced per day for one person who requires the emergency breathing device?
the ratio between CO2 and O2 is 2 : 1


Moles O2 = 5.00


20 moles Na2O2 needed =%26gt; 20 x 78 g/mol = 1560 g
Reply:FYI NaCO2 is no longer used on US submarines.





LiOH and NaC2 are used for emergency scrubbing now.





NaCO2 was used in OBA (Rebreathing technology) but have now been discontinued.





I know the spirit of the question, but just wanted to add my two sense.


How many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?

For the reaction








SO2 + O2 → SO3








how many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?





Enter a numeric answer only, no units.

How many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?
3.44


What makes moles grow on your body?

When I was diagnosed with diabetes I started getting moles all over the my upper back. Now I have about 15 or 16 small moles on the shoulder part of my upper back, 2 or 3 on my neck and 1 on the left side of my face on my hair line. Do any of you know why this happened? what is a mole?

What makes moles grow on your body?
Moles are not "caused", they just develop...usually (but not always) before the age of 20. Moles are simply a growth of pigmented cells. Most appear spontaneously or from exposure to sunlight. Moles are very common.





Just always remember to keep an eye on your moles for the ABC's of melanomas:


asymmetry


border


color


diameter


elevation


If you see changes in an existing mole, always have it checked out by a dermatologist.

grappling

About My Moles?

I tryed pulling out all the moles on my face, it worked but only the mole on my lip stayed dissapeared but the other moles grew back! How can i remove it without a dermentologist or doctor?

About My Moles?
Oh my goodness.... you really shouldn't pull or pick at moles... it's really unhealthy. Sweetie the only way to get rid of a mole forever (safely) is to go to a doctor...
Reply:ouch!!!!!!
Reply:I really think you should consult a doctor for this.
Reply:Be careful. Sometimes moles have blood vessels in them %26amp; you might rupture it %26amp; bleed to death. Ok ... not to death. You might also cause scaring. Please go to a doctor to have them removed.
Reply:You really shouldn't pulled out the moles off your face. If it kept growing back it could one day turn cancerous. Not to mentioned you might end up with a facial skin that looks like the surface of the moon. Really, do consult a dermatologist. BTW, try reading "The chinese act of face reading". It tells you at you age, where the moles are and what it indicates ie your health, wealth etc. Then you could remove the bad one and keep the good moles.





You know that the mole that has disappeared from your lip, that mole indicates that you will never be out of food. No matter what's the position you're in, food is always aplenty for you. I'm sorry but I just can't help laughing,... you have removed your "food storage". I hope that grows back. Good Luck and I don't mean to be rude but it really is funny that you have removed a good mole.
Reply:You cant!
Reply:try this ( =


http://www.fonoils.com/moles.html


How many moles of O subscript 2 can be produced by letting 12.00 moles of KClO subscript 3 react?

Given the following equation: 2 KClO subscript 3 ---%26gt; 2 KCl + 3 O subscript 2





How many moles of O subscript 2 can be produced by letting 12.00 moles of KClO subscript 3 react?





does anyone know the steps to do this? I really dont understand how im supoused to calculate this. I dont even understand what the question is asking!!!

How many moles of O subscript 2 can be produced by letting 12.00 moles of KClO subscript 3 react?
18 mol of Osub2





For every 2 mols of KClOsub 3 you get 3 mols of Osub2





there are better ways to calculate that. This was off the top of my head.


How many moles of O2 should be supplied to burn 1 mole of C3H8 (propane) molecules in a camping stove?

How many moles of O2 should be supplied to burn 1 mole of C3H8 (propane) molecules in a camping stove?

How many moles of O2 should be supplied to burn 1 mole of C3H8 (propane) molecules in a camping stove?
this is a combustion reaction;





C3H8 + 5O2 --%26gt; 3CO2 + 4H2O





According to the balanced reaction equation given above, the mole ratio between O2 and C3H8 is 5:1


Thus, 5 moles of O2 should be supplied to burn 1 mole of C3H8





hope this helps:-)
Reply:Given that the 2 products of combustion are CO2 and H2O, I count 5 O2's to balance that equation.





C3H8 + 5O2 =%26gt; 3CO2 + 4H2O





.


Limiting reagents/moles help!!?

A student combusts 15 g of methane (CH4) with 50. g of oxygen to form carbon dioxide and water.





1.Write out the balanced chemical reaction.


2. Which reactant is the limiting reagent?


3. How many moles of water will be produced?


4. What mass of carbon dioxide will be produced?


5. After the reaction is completed how many moles of methane will remain? (amount of reactant remaining = initial amount of reactant - amount of reactant consumed by the reaction)


6. After the reaction is completed how many moles of oxygen will remain?





please help me!!

Limiting reagents/moles help!!?
1) CH4 + 2O2 --%26gt; CO2 + 2H2O


2) Methane


3) 1.875 moles


4) 41.25 g


5) 0 moles


6) 1.25 moles





I think those are right
Reply:I answered your question

yoga

How many moles of Pb Metal would form when the PbCO3 is heated?

There is PbCO3 Pure cerusitte and we are determining how many moles are there there in 7.5g of the starting material..I get 35.6 moles..The next question is .....How many moles of Pb Metal would form when the PbCO3 is heated?

How many moles of Pb Metal would form when the PbCO3 is heated?
1) How many moles are there in 7.5 gram of PbCO3 ?


1 mol of PbCO3 is 207.2 + 12.01 + 3*16.00 = 267.2 gram


7.5 gram = 7.5 g / 267.2 g/mol = 0.0281 moles.





2) For every molecule of PbCO3 one atom of Pb is formed. There are therefore as many moles of Pb as mole of PbCO3, that is 0.0281 moles.





3) How many grams of lead are formed?


0.0281 moles = 0.0281 moles x 207.2 g/mol = 5.82 g


How many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?

For the reaction








SO2 + O2 → SO3








how many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?





Enter a numeric answer only, no units.

How many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?
3.44

ivy

How many moles of H2O are produced by the reaction of 3.20 moles of O2?

How many moles of H2O are produced by the reaction of 3.20 moles of O2?





4NH3 + 3O2 --%26gt; 2N2 + 6H2O

How many moles of H2O are produced by the reaction of 3.20 moles of O2?
6.40


The way you calculate that is to first find the ratio of input to output.


Since the input of O2 is 3 and the output of H2O is 6, you can see that the ratio is 6/3.


6/3 is 2.


To determine the output corresponding to a given input, multipy the input by the ratio.


3.20 x 2 = 6.40


About My Moles?

I tryed pulling out all the moles on my face, it worked but only the mole on my lip stayed dissapeared but the other moles grew back! How can i remove it without a dermentologist or doctor?

About My Moles?
Oh my goodness.... you really shouldn't pull or pick at moles... it's really unhealthy. Sweetie the only way to get rid of a mole forever (safely) is to go to a doctor...
Reply:ouch!!!!!!
Reply:I really think you should consult a doctor for this.
Reply:Be careful. Sometimes moles have blood vessels in them %26amp; you might rupture it %26amp; bleed to death. Ok ... not to death. You might also cause scaring. Please go to a doctor to have them removed.
Reply:You really shouldn't pulled out the moles off your face. If it kept growing back it could one day turn cancerous. Not to mentioned you might end up with a facial skin that looks like the surface of the moon. Really, do consult a dermatologist. BTW, try reading "The chinese act of face reading". It tells you at you age, where the moles are and what it indicates ie your health, wealth etc. Then you could remove the bad one and keep the good moles.





You know that the mole that has disappeared from your lip, that mole indicates that you will never be out of food. No matter what's the position you're in, food is always aplenty for you. I'm sorry but I just can't help laughing,... you have removed your "food storage". I hope that grows back. Good Luck and I don't mean to be rude but it really is funny that you have removed a good mole.
Reply:You cant!
Reply:try this ( =


http://www.fonoils.com/moles.html


How many moles of NaOH are required to neutralize 1.254x10^-3 moles of oxalic acid dihydrate?

How many moles of NaOH are required to neutralize 1.254x10^-3 moles of oxalic acid dihydrate?





oxalic acid dihydrate is diprotic

How many moles of NaOH are required to neutralize 1.254x10^-3 moles of oxalic acid dihydrate?
Since oxalic acid is diprotic, it will release 2 H+ for every molecule dissolved. NaOH only release one OH- for each molecule dissolved, so you need twice as much NaOH as oxalic acid.





(1.254x10^-3 mol oxalic acid) * 2 = 2.508*10^-3 mol NaOH
Reply:you need to write the balanced equation.





im too lazy to look up the chemical formula for oxalic acid... but you would only need then to mulitiply that given number by the ratio of NaOH to it to get the number of mole NaOH needed.


What is the connection between Moles (skin) and Cancer?

If you have a mole/s does it mean you have cancer?


If you have a mole/s does it mean you can get cancer?


If you have had a moles froma young age, does it mean you are at risk?


If you are a child (1-18 years old) can you get cancer through a mole?


What are moles?





i would really want to know the information above, will be most greatful....or any information at all will be also helpful

What is the connection between Moles (skin) and Cancer?
Phew lots of questions! I'll try to break each answer down





-Moles are not cancer. Most moles will not turn into cancer.





-Moles do have the potential to turn into cancer. You should keep an eye on them. Over 90% of moles will stay the same throughout life. Any mole which suddenly appears, or an existing mole which changes shape or colour is concerning and should be examined by a dermatologist.





- The variables which can affect whether moles are likely to be cancerous are; a family history of cancers, sunlight exposure and other carcinogen exposure such as smoking.





-Moles in childhood are extremely unlikely to turn into cancer whilst a child. But as i said, as the child gets older they should be aware of their moles and notice any change





-Moles are a high collection of melanocyte cells. They provide melanin which gives people their skin colour. People with darker skin have more melanocytes and thus more melanin but will rarely have moles on their body as the melanocytes are spread evenly throughout the skin. Melanin provides protection from the damaging affects of the sun.





-Most people will have 1 or 2 moles they have had since a young age





-Moles can develop as a response to sunlight. These are the new moles i mentioned which are at higher risk of being cancerous.





Hope this helps.
Reply:check this site out,


http://www.cancer.gov/cancertopics/wyntk...


lots info on left hand side of the above website


having moles does not mean you get cancer


some moles can turn mallignant..but these are usally an odd shape and not round


most people get moles at a young age.would worry if a new one appeared when older/get checked out


anyone can get cancer from a mole...good to keep an eye on all of them..change of shape or colour/itching then must go to doctor.
Reply:i dont know thanks 2 pwon
Reply:Everyone has moles so you've no need to worry unnecessarily. They are just skin discolourations - sort of birthmarks. However, if you sunbathe a lot you can damage your skin. This sometimes shows up as brown spots which look similar to moles. They are also called age spots (because old skin has been exposed to the elements a lot longer than young peoples' skin). These are not cancerous in themselves - but as they are caused by too much sun (and are therefore bits of skin damage which wasn't there before) it's useful to have a look at them regularly to make sure they haven't changed. It's useful, if you are young, to occasionally look at all your moles to make sure they haven't changed shape or are not looking/feeling like they normally do (going crusty or weeping or bleeding - something like that). If that happens.....THEN you take yourself off to the doctor to have them professionally checked out. More often than not the doctor will tell you everything is OK, but if he thinks you DO have a 'dodgy' one, he'll send you for tests to make sure it isn't skin cancer. If it's caught in the early stages it can be cured. People who see changes and then waste time worrying about it but do nothing are the ones who have problems because they've left it too long and have to undergo lots of treatment. If you've got a mole that bothers you, go and see your doctor to put your mind at rest.
Reply:No moles are not all cancerous but if the mole is thick and nearly black not asymetric you should consult a dermatologist first.


No but it is safe to keep an eye on it .. or have it check by dermatologist.


No


Yes children do get skin cancer (melanoma) usualy fair skin or someone expose to the sun alot.


check the site you will see and learn alot form this

fuchsia

Cats and moles PLEASE HELP....DUE TOM!!!**?

A mole of atoms is 6.02*10^23 atoms. To the nearest order of magnitude, how many moles of atoms are in a large domestic cat?





The masses of a hydrogen atom, an oxygen atom, and a carbon atom are 1.0u, 16u, and 12u





(HINT: cats are sometimes known to kill moles)

Cats and moles PLEASE HELP....DUE TOM!!!**?
First rough estimate that an average large cat weighs 7kg (Wikipedia)





Second, average molecular weight of the atoms. Take H20 (your body is mainly water). Molecular weight 18, atoms 3, average weight per atom 6.





Therefore, the average large cat has 7kg / 6 gr/mole=


1167 moles.





# atoms


= 1167 * 6.02x10^23


= 7.023 x 10^26 atoms


How do moles form in the skin?

I've always wondered specifically, how do moles form in people's skin? I know some of it is hereditary and related to the skin cells. Also I was wondering if there is any way of either preventing moles from forming or getting rid of moles without the use of surgery?

How do moles form in the skin?
From WebMD:


"Moles occur when cells in the skin grow in a cluster instead of being spread throughout the skin. These cells are called melanocytes, and they make the pigment that gives skin its natural color. Moles may darken after exposure to the sun, during the teen years, and during pregnancy."





R. Cooper, Librarian


Librarians ... the ultimate search engine
Reply:aging is one cause of developing a mole..
Reply:Moles, while cute, are considered to be an agricultural pest in some countries, while in others, such as Germany, they are a protected species but may be killed if a permit is received. Problems cited as caused by moles include contamination of silage with soil particles making it unpalatable to animals, the covering of pasture with fresh soil reducing its size and yield, damage to agricultural machinery by the exposure of stones, damage to young plants through disturbance of the soil, weed invasion of pasture through exposure of fresh tilled soil, and damage to drainage systems and watercourses. Other species such as weasels and voles may use mole tunnels to gain access to enclosed areas or plant roots.





Moles that burrow in the lawns of humans can disturb the earth, raising molehills and causing enough aesthetic problems, and killing enough of the lawn, to be considered as pests. They do however benefit the soil by aerating and tilling it, adding to its fertility. Contrary to popular belief, moles don't eat plant roots.





============


Oh, sorry, wrong type of mole! Moles have two major causes. Sunlight and Genes. Some scientists suspect that overexposure to ultraviolet light, including excessive sunlight, may play a role in the formation of acquired moles. However, more research is needed in this area.





Genes can also have an influence on a person’s moles. Dysplastic nevi or atypical mole syndrome is a hereditary condition which causes the person to have a large quantity of moles (often 100 or more) with some larger than normal or atypical. This often leads to a higher risk of melanoma, a serious skin cancer. A slight majority of melanomas do not form in an existing mole, but rather create a new growth on the skin. Nevertheless, those with more dysplastic nevi are at a higher risk of this type of melanoma occurrence. Such persons need to be checked regularly for any changes in their moles and to note any new ones.


How many moles?

Consider the reaction CH4 + 2O2 -%26gt; CO2 + 2H2O





Exactly 14.5 moles of CO2 are produced upon reaction of 34.6 moles of O2 and how many moles of CH4?





How would i find this and what formula would i use?

How many moles?
You would use the balanced reaction mentioned above.





CH4 + 2O2 -%26gt; CO2 + 2H2O





From this one mole of methane will produce one mole of carbon dioxide. Therefore 14.5 moles of methane will produce 14.5 moles of carbon dioxide.


Conversion with Moles!?

1. Convert 2.56 moles N20 to molecules


2. Convert 3.0 x 10^24 molecules H20 to moles H20


3. Calculate the mass of 4.52 mol silver.


4. Calculate the number of moles of CH4 in 84g CH4.





Any help is greatly appreciated, and please explain.

Conversion with Moles!?
1 mole ==%26gt; 6.02 x 10^23





1.


2.56 x 6.02x10^23 = 1.54 x 10^24





2.


3.0 x 10^24 / 6.02 x 10^23 = 4.98





3.


Atomic weight = 107.870 g/mol


4.52 mol x 107.870 g/mol = 487.6 g





4.


Molar mass = 16 g/mol


84 g / 16 g/mol = 5.25 mol

paper bush

How many moles of Hydrogen are needed in order to produce 4 moles of ammonia?

According to the following reaction, how many moles of hydrogen are needed in order to produce 4 moles of ammonia? 3 H2 (g) + N2 (g) ----%26gt; 2 NH3 (g)

How many moles of Hydrogen are needed in order to produce 4 moles of ammonia?
6 moles hydrogen because the ratio of hydrogen and ammonia is: 3:2. So if 4 moles of NH3 are produced so the amount of moles of H2 must be double
Reply:6 moles


How many moles of CaCN2 are needed to produce 20.0 moles of NH3?

Consider the ff. reaction:





CaCN2 + 3 H2O --------- CaCO3 + 2 NH3





which has a 50.0% yield. How many moles of CaCN2 are needed ot produce 20.0 moles of NH3?





molar mass for CaCN2 is 80.11 g/mol


molar mass for CaCO3 is 100.09 g/mol





Could you please show me an easy, step by step way to finish the problem, thank you.

How many moles of CaCN2 are needed to produce 20.0 moles of NH3?
CaCN2 +3H2O ------------ CaCO3 +2NH3


1________________________%26gt;2


20/2%26lt;_____________________20


in theory:


nCaCN2= 10 moles





in fact, n CaCN2=(10/50)*100=20 moles


Melanoma moles?

okay, lately ive been reading all the teen magazines, like 17, glamor and cosmo. and they are all scaring my sh**less about melanoma. what worries me most is that i never really payed attention to my "mole" until i read this magazine. and it said asymmetrical borders which is just killing me because i seem to have like this small mole on my stomach but i never remembered it being exactly round or symmetrical throughout my life. and its freaking me out, it doesn't look super asymmetrical just not perfectly round, and i really don't no if it could be malenoma or not. i asked my mom which is a nurse and she said that it isnt but im still skeptical. i keep telling myself its not possible since i only tanned 5 times at a tanning salon, and i tan outside, and im only 15. also my sisters which are both almost 30 tanned so much in their teen years but theres nothing wrong, same with my mom who tanned a lot too. im not goin to the doc N.E.timesoon. anyone has personal experience with M. moles?

Melanoma moles?
A mole doesn't have to be perfectly symmetrical. If your mole is like that for as far as you can remember, if it doesn't grow and doesn't change within months, it's not melanoma. You are not too young to have melanoma, I had a student who had a melanoma at 19 years old and the fact that your sister tanned more than you and doesn't have melanoma doesn't mean a thing. My student never used a tanning salon and she still had melanoma.


I suggest you to watch your mole and if it doesn't grow or change, leave it alone.


Here I wrote something about melanoma:


http://www.newcancerguide.com/tag/skin-c...
Reply:well if your really still scared about it, get a doctors opinion or even maybe a dermatologis. WEAR sunblock wen you tan.
Reply:Look up pictures on the internet of these types of moles. The magazines are right about the asymmetry, but also the coloring is important. The coloring should be all one color. Also look at the edges of the mole. If the edges are sharp and has many points, like a star does, then that is a sign of cancer. Another sign is that it grows or changes shape over a period of time. I do a once a month mole check all over my body to verify that they are staying the same.


Converting moles into grams?

1. 1 mole of HCl is equal to __________g(grams) of HCl


2. 1 mole of CaCl2 is equal to __________ g of CaCl2


3. 2 moles of (NH4)2SO4 (ammonium sulfate) is equal to _________g of ammonium sulfate














i dont understand how to do these at all anyhelp will be appreciated

Converting moles into grams?
A mole can be expressed as gram/mole equal to the Molecular weight of the compound: -





1)...HCl = 1 + 35.5 = 36.5g/mol. (1xH + 1xCl)


2)...CaCl2 = 40 + 71 = 111g/mol. (2xCa + 2xCl)


3)...(NH4)2SO4 = 28 + 8 + 32 + 64 = 132 x 2 moles


....... = 264g/mol. ........2 x (2xN + 8xH + 1xS + 4xO).
Reply:Multiply the number of moles by the Mr (= sum of Ar values).


I'll do the first one:





1 x (1 + 35.5) = 36.5g HCl
Reply:Err. Just find the molecular weight of the Substance.





In HCl, its 1 + 35.5 = 36





So gram molar mass of HCl is 36.5,





ie 1 mole of HCl = 36.5 grams,





Similarly for CaCl2 and ammonium sulphate. I don't remember the molecular weight of Ca. Was it 40 or 41?








The basic thing is, that you find the molecular weight and write a " gram " next to the number you get. That is the gram molecular weight of the compound, and that is the mass of 1 mole of that substance.





If you have 2 moles, multiply the gram molecular weight by 2, and so on. So gram molar weight of a substance is the weight of 6.023 * 10^23 ions / atoms/ molecules of that substance, and is the same as moleculer weight, only usually, when you say molecular weight, its in amu. and GMW is in grams.
Reply:couple of resources for you ...
Reply:1) 36.5g





2) 111g





3) 132 x 2 = 264g
Reply:2) 1 mole CaCl2





Ca = 40.078 g/mole Cl 35.5 g/mole





Ca + 2 Cl = 40.078 +2(35.5) = 111.078 g/mole





so you'd need 111.078 g





3) 2 moles (NH4)2SO4





N=14.0067 H=1.0079 S= 32.066 = 15.9994





NH4 = 14.0067+4(1.0079)= 18.038 g/mole


SO4 = 32.066 + 4(15.9994)= 96.0636 g/mole





(NH4)2SO4 = 2(18.038)+96.0636 = 132.1396 g/mole





2 mole would be 264.2792 g

daphne

Convert moles to atoms?

Award the best answer if you can answer the following with steps:


1. 8.15 moles of Mg


2. 21.3 moles of I2


3. 2.34 moles of Na2CO3





*Note that I2 where 2 is a subscript also Na2 and CO3

Convert moles to atoms?
1 mole = 6.02 * 10^23 atoms


literally multiply through bro...


1) 8.15 moles of Mg


(6.02 * 10^23) * 8.15 =


4.9063 * 10^24 atoms





2) 21.3 moles of I2


(6.02 * 10^23) * 21.3 = 1.28226 * 10^25 MOLECULES (because I2 is a molecule) Multiply by 2 to get atoms...


2(1.28226 * 10^25) =


2.56452 * 10^25 atoms





3) 2.34 moles of Na2CO3


(6.02 * 10^23) * 2.34 = 1.40868 * 10^24 molecules


In each molecule, there are 2 Na, 1 C, 3 O = 6 atoms


Multiply by 6


1.40868 * 10^24 =


8.45208 * 10^24 atoms





Tada..hope this was thorough enough


hard to type out the numbers
Reply:ill do 1.








8.15 moles 6.02 x 10 to the 23 molecules 1 atom


--------------- x ---------------------------------------- x -----------


1________________mole_________________ molecule


Calculatig moles?

Question: How many moles of H atoms are found in 4.5 moles of (NH4)2SO4 (ammonium sulfate)?





Do I need to set up mole ratios for ammonium sulfate and H?

Calculatig moles?
there are 8 hydrogen atoms in ammonium sulfate, so all you have to do is multiply 4.5 with 8, which is 36.


7 moles have recently appeared on my face. They are all small and flat (darker than freckles) 1mm by 1mm etc.?

My face is pale at the moment. I am in my mid teens. If I go out in the sun to get a tan on my face (wearing sunscreen of course!) will I get more facial moles from the sun or will my moles get bigger and stickout?





I am worried about going in the sun now. I don't want anymore moles!

7 moles have recently appeared on my face. They are all small and flat (darker than freckles) 1mm by 1mm etc.?
You should see a dermatologist if it worries you.
Reply:might be skin cancer
Reply:See a dermatologist. This is a question you should be asking to a doctor, who is a specialist in these matters.
Reply:Its not skin cancer! lol..Dont worry about cancer...I dunno what they are though...Just wear a heavy sunscreen
Reply:get that checked out by a doctor now, ever heard of skin canser?
Reply:I don't think they'll get any bigger, but the number of them might increase. Remember tanning isn't good for you, especially if you have pale skin. Wear a sunscreen!
Reply:My own personal experience is that some people are more prone to get moles than others, I am. I've found over the years that even a breakout can turn into a mole. They usually get larger over the years having nothing to do with the sun. If you get alot of moles it's good to have them removed and checked to make sure they are not cancerous. They probably wont be but that way your insurance will cover the cost of it. Gold Luck.
Reply:They are more than likely whats called seborrheic keratosis. Its just a normal thing that happens as we age. I have 3 grouped together by my left eye and to be quite honest I love them. I believe they developed in my teens as well. They are harmless unless theres pain or irritation and can be easily removed by a dermatologist if that is the case. These are genetic moles, so odds are the sun isnt your problem. You can always get them removed if you feel that they are unsightly.


Calculate the number of moles of potassium chlorate, ....?

Calculate the number of moles of potassium chlorate, KCLO3(s) that must decompose to produce potassium chloride, KCL(s) and 1.80 moles of oxygen gas.





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

Calculate the number of moles of potassium chlorate, ....?
2KClO3(s) --%26gt; 2KCl(s) + 3O2(g)





divide the equation by the moles of the substance you are given as a know (O2)





2/3KClO3(s) --%26gt;2/3KCl + O2(s)





this says for every mole of O2 produced 2/3 mole of KClO3 was required





so if you have 1.8 moles O2





then you need ==%26gt; 1.8 * 2/3 moles KClO3 = 1.2 moles KClO3
Reply:The balanced equation is :


2 KClO3 %26gt;%26gt; 2 KCl + 3 O2


the ratio between KClO3 and O2 is 2 : 3


moles KClO3 needed = 1.80 x 2 / 3 = 1.20

camellia

Calculating moles?

i did an experiment and the moles of iodine formed was 7/3750





and i'm supposed to know use the equation





ascorbic acid+I² → 2 Iˉ +dehydroascorbic acid








to find the moles of ascorbic acid





after i have to calculate the concentration in mol Lˉ¹








except, i don't know how!


help?





btw, i'm only a freshman in high school


and i'm taking biology


so this whole moles thing is new to me.

Calculating moles?
Moles are simply the atomic mass of an element or compound expressed in grams. e.g. one mole of oxygen gas (O2) would weigh 2 x 16g = 32 g. One mole of MgO would weigh 24.3 + 16 = 40.6g.


Get your balanced equation of Asc. acid + I2 -%26gt; products and simply convert to masses


Calculating the number of moles of each reactant?

When 111.7 g of iron and 212.7 g of chlorine gas completely react, iron(III) chloride, FeCl3, is formed. Calculate the number of moles of each reactant.





first, i made up and balanced the equation: 2 Fe + 3 Cl2 --%26gt; 2 FeCl3. To figure out the number of moles, I divided the molar masses into the masses that were given:


111.7 g Fe / 55.8 g Fe = 2.00 mol Fe, and


212.7 g Cl2 / 70.8 g Cl2 = 3.00 mol Cl2.





Is this correct? I don't think it is because the answers are the same as those in the balanced equation.





And once you find the number of moles, to get the amount of grams, you use the number of moles in the balanced equation and divide that into the moles you find from calculating, right?

Calculating the number of moles of each reactant?
It is correct. And your question about determining moles is also correct (yet not asked very clearly).


Don't doubt yourself so much. If the numbers all verify your answer, you are most likely right


Average moles of NaOH requred to neutralize the HCl?

i had a sub today and they didn't know how to help me on this question. and i can't find anywhere how to do this question. can you guys please help me ?





i'm given the information that Volume of 0.109 M NaOH requred to neutralize 25.0 mL of HCl.





One of the questions are: determine the average moles of NaOH required to neutralize the HCl.


i tried doing this question, but i dont know if i did it correct.. i got 0.190M = 0.190mol/L x 0.025L = 0.0475mol


i dont know if thats right though.. =/





also.. how do u determine how many moles of HCl were neutralized by the moles of NaOH used. i have NO idea how to do that question.





thanks in advance =)!!

Average moles of NaOH requred to neutralize the HCl?
it depends on how many moles of HCl you have, which depends on the molarity of the 25mL of HCl (i doubt youre using 25mL of liquified HCl)





HCl and NaOH neutralize on a 1:1 ratio (acid-base reaction)


you are neutralizing the acidic H from HCl with the basic OH from NaOH





after they react, you are left with H20 (water) and NaCl (table salt)





are you sure you wrote the question right?
Reply:You need the concentration of HCl, unless you have it you can not solve this question.


Average moles of NaOH requred to neutralize the HCl?

i had a sub today and they didn't know how to help me on this question. and i can't find anywhere how to do this question. can you guys please help me ?





i'm given the information that Volume of 0.109 M NaOH requred to neutralize 25.0 mL of HCl.





One of the questions are: determine the average moles of NaOH required to neutralize the HCl.


i tried doing this question, but i dont know if i did it correct.. i got 0.190M = 0.190mol/L x 0.025L = 0.0475mol


i dont know if thats right though.. =/





also.. how do u determine how many moles of HCl were neutralized by the moles of NaOH used. i have NO idea how to do that question.





thanks in advance =)!!

Average moles of NaOH requred to neutralize the HCl?
it depends on how many moles of HCl you have, which depends on the molarity of the 25mL of HCl (i doubt youre using 25mL of liquified HCl)





HCl and NaOH neutralize on a 1:1 ratio (acid-base reaction)


you are neutralizing the acidic H from HCl with the basic OH from NaOH





after they react, you are left with H20 (water) and NaCl (table salt)





are you sure you wrote the question right?
Reply:You need the concentration of HCl, unless you have it you can not solve this question.

lady slipper

Brown moles?

Brown moles on face and neck.


they are mole size, but not a mole. So i am not sure what can it be named as. i had 2-3 on my face and later i found them many on face and neck. How can i avoid and prevent this? Pls help! any skin specialist advices are very welcome

Brown moles?
Prepare a paste of baking soda and castor oil. Soak some gauze in this mixture and tape this gauze over the mole. Leave the gauze on overnight. This will possibly remove moles over time.


The real cure (and prevention) for the moles is to eat enough foods that contain potassium or take apple cider vinegar that contain potassium.


Take a small piece of garlic; place it over the mole, scraping the flat side of the garlic that touches the mole so the juice can get onto it. Keep this for the whole day and night. Within two to three days, the mole will disappear.


Rub some iodine on the mole at night for two three days. This is an effective remedy for the moles.


One thing to avoid is over exposure to the sun and if you are in the sun wear sunblock
Reply:Let your doc see them first and ask him.
Reply:skin tag
Reply:there are no ways to prevent them but you can have a doctor remove them and they should not grown back.
Reply:are the moles raised up off ur skin, if so those are called skin moles. U can go to a dermatologist about them. If they are not raised, a lot of people call them little beauty marks like women who may have one under their eye or above their mouth. My mom has a lot of little moles and she went to her doctor, the doctor said there is nothing to worry about. But go have them checked out, good to be safe than sorry.