IdahoDoc

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Aug 26, 2007
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Dental Student
If someone could please explain how they are setting up this problem that would be great. I can do the math out and get the correct answer i just don't see how they set it up. thanks
 

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Svart Aske

Dental Padawan
10+ Year Member
Jun 7, 2008
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It doesn't display on my Word. You might want to repost in another format if others can't see.
 

yankees27th

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Nov 3, 2008
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Same here. Word pops up and says "quicktime and decompressor are needed to see this picture"
 
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IdahoDoc

10+ Year Member
7+ Year Member
Aug 26, 2007
500
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Dental Student
Thanks guys I will try to do it another way.
 

Panther85

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Aug 20, 2007
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Podiatry Student
Qhow many moles of water are formed from 100g H2 and 100g O2 asssuming the reaction goes to completion?

1) write out formula: H2+.5O2-> H2O
2) find limiting reactant- its oxygen bc it has a heavier molar mass compared to hydrogen therefore there are less moles of O2 in 100g than moles of H2. dont bother doing the calculation: save time
3) set up dimensional anaylsis:
)
100 g O2 x (1 mol O2/ 32g O2) x ( 1 mol H2O/ .5 mol O2) = 100/(32x.5) or 2(100/32) which is choice C
 

IdahoDoc

10+ Year Member
7+ Year Member
Aug 26, 2007
500
1
Status
Dental Student
Qhow many moles of water are formed from 100g H2 and 100g O2 asssuming the reaction goes to completion?

1) write out formula: H2+.5O2-> H2O
2) find limiting reactant- its oxygen bc it has a heavier molar mass compared to hydrogen therefore there are less moles of O2 in 100g than moles of H2. dont bother doing the calculation: save time
3) set up dimensional anaylsis:
)
100 g O2 x (1 mol O2/ 32g O2) x ( 1 mol H2O/ .5 mol O2) = 100/(32x.5) or 2(100/32) which is choice C
Thanks Panther 85, I got it now I was skipping this part (1 mol H2O/ .5 mol O2).
 
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