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Gas stoichoiometry

  1. Sep 27, 2008 #1
    1. The problem statement, all variables and given/known data
    A compound has the empirical formula CHCl. A 256 mL flask, at 373 K and 750. torr, contains 0.800 g of the gaseous compound. Give the molecular formula.


    2. Relevant equations
    Only equation i know that relates to this is PV=nRT.


    3. The attempt at a solution
    I have absolutely no idea.
     
  2. jcsd
  3. Sep 27, 2008 #2

    Redbelly98

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    That's the right equation. Plug in all the numbers you can into it, and see what happens.
     
  4. Sep 28, 2008 #3
    All that will give me is "n." what good does that do?
     
  5. Sep 28, 2008 #4

    Borek

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    n and 0.8 g - combine these two numbers.
     
  6. Sep 28, 2008 #5
    how does that give me the molecular formula? i'm still lost...
     
  7. Sep 28, 2008 #6

    Redbelly98

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    The empirical formula is CHCl. Given that, what are the possible molecular formulas?
     
  8. Sep 28, 2008 #7

    Borek

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    Check what it does give you. Very important property of substance.
     
  9. Sep 28, 2008 #8
    By this do you mean add n and 0.8? If so then i get 0.808. now what?
     
  10. Sep 29, 2008 #9

    Borek

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    No, I didn't told you have to add them. Look at the units - one is number of moles, second is grams. You can't add them just like that.

    There is a very important property of each reagent that combines moles and grams, and is extensively used in all almost chemical calculations. Seems to me like you have calculated that 0.008 mole is 0.8 g. Can you calculate now mass of other number of moles of the same substance?
     
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