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Question
Submitted by michiermartins on Wed, 2012-02-22 14:41
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which of the following compounds contains the largest number of atoms? 1.0 mol of CH3COCl, 2.0 mol of H2SO4, 3.0...

which of the following compounds contains the largest number of atoms? 1.0 mol of CH3COCl, 2.0 mol of H2SO4, 3.0 mol of NH3, 4.0 mol of K2S, or 5.0 mol of HBr

Answer
Submitted by Coloratus on Wed, 2012-02-22 18:00
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xx xxxx xx through each xxxxxxxx and xxxxxxxxx xxx xxxxxx of xxxxx of xxxxx xxx each xxxxxxxxx xxx compound with xxx xxxxxxx xxxxxx of moles of xxxxx xx xxx compound xxxx xxx xxxxxxx number xx atoms:
a) 1.0 xxx of CH3COCl - xxxxxxx has x xxxxx in xxx molecule, xx xxx number xx moles xx xxxxx xxx xxx mol * x = 7 mol
b) 2.0 mol xx H2SO4 - xxxxx xxx x atoms xx xxx molecule, so the number of xxxxx xx xxxxx is: 2.0 mol x 7 x xx xxx
xx 3.0 mol of NH3 x xxx xxx x xxxxx in xxx molecule, xx the number of xxxxx xx atoms is: 3.0 xxx * x = xx xxx
d) xxx xxx xx xxx x xxx has 3 xxxxx xx one xxxxxxxxx xx xxx xxxxxx xx moles xx xxxxx xxx xxx xxx x x x 12 xxx
d) 5.0 xxx of xxx - HBr xxx x xxxxx xx xxx xxxxxxxxx xx the number of xxxxx of atoms xxx 5.0 xxx * x x 10 xxx

xxx the compound xxxx the xxxxxxx number of atoms is H2SO4.


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Answer
Submitted by Andrein on Wed, 2012-02-22 16:28
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The answer is: 2 mol of H2SO4 (Detailed answer below)

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xx xxxxxx xxxx question xx will use the Avogadro's number xx = xxxxx x 10^23 xxxxxxxx x
xxxxxxxxxx xxxxxx means xxxx xxxxx are xxxxx x 10^23 entities xxxxxxxxxxx atoms etc.) for each mol of xxx given substance.
For example, 1 mol of xx xxxx xxxxxxx xxxxx x xxxxx Helium atoms, xxxxx as x mol of xxx will have xxxxx x xxxxx molecules xx xxxxxx and xxxxx xx has x xxxxx xx xxxx xxxx 3 x xxxxx x xxxxx xxxxxx
.
xxxx to xxx xxxxxxxx We xxxx calculate xxx number of atoms xxx each substance using the xxxxxxxx above.
x
x
1.0 mol xx CH3COCl xxx 6.022 x xxxxx molecules of xxxxxxxx
xxxx xxxxxxxx xxx x xxxxx (2 Carbon xxxxxx 3 Hydrogen xxxxxx one xxxxxx atom and one Chlorine xxxxxx
xxx xx xxxxx we have:
xxx mol xx xxxxxxx xxx x * xxxxx x xxxxx atoms = xxxxxx x 10^23 atoms.
.
x
2.0 mol of H2SO4

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