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Gen Chem simple set up problem

Discussion in 'DAT Discussions' started by IdahoDoc, Dec 19, 2008.

  1. IdahoDoc

    7+ Year Member

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    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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  2. Svart Aske

    Svart Aske is stabbing his eyes out
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    It doesn't display on my Word. You might want to repost in another format if others can't see.
     
  3. yankees27th

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    Same here. Word pops up and says "quicktime and decompressor are needed to see this picture"
     
  4. IdahoDoc

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    Thanks guys I will try to do it another way.
     
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  5. Panther85

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    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
     
  6. IdahoDoc

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  7. IdahoDoc

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    Thanks Panther 85, I got it now I was skipping this part (1 mol H2O/ .5 mol O2).
     
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