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Ideal Gas Law

  1. May 11, 2009 #1
    If anyone has time, could you please show me the working of this problem.

    Greatly appreciated


    b]1. The problem statement, all variables and given/known data[/b]
    If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87C, how many moles of gas do I have?


    2. Relevant equations

    PV=nRT=NkT

    3. The attempt at a solution

    1.2 x 31=n8.3145 x (87+273)= N x 1.38066x10*23 x (87+273)

    Can you tell me if the above numbers are correct please.
     
  2. jcsd
  3. May 11, 2009 #2

    Andrew Mason

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    You have to stick to MKS units. Volume has to be in m^3 not litres. Otherwise, it looks fine.

    AM
     
  4. May 11, 2009 #3
    The pressure should be in pascals as well.
     
  5. May 11, 2009 #4

    Andrew Mason

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    Of course! Thanks for catching that.

    AM
     
  6. May 12, 2009 #5

    Redbelly98

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    Given what is being asked, would you use nRT or NkT here?
     
  7. May 13, 2009 #6
    nRT ??
     
  8. May 13, 2009 #7

    Redbelly98

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    Why do you think that ... or is it just a random guess? The key here is: what do n and N mean?
     
  9. May 13, 2009 #8
    n - number of moles

    N - number of molecules
     
  10. May 14, 2009 #9

    Redbelly98

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    Okay, yes. n is the number of moles, so PV=nRT is the thing to use here.

    Just be careful with the units, as others said earlier.
     
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