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Homework Help: Gas Law problem please help

  1. Feb 12, 2009 #1
    Gas Law problem.... please help

    Calculate the average kinetic energies of the CH4 and N2 molecules at 294 K and 574 K.

    I've tried every possible way I could think of. I can't get the right answer. I don't know what equation to use anymore, I've done it all and nothing works.

    I got all these answers:

    676
    4.06e-21
    4333.34
    J/molecule 3 sig figs
    And none of them are good. I'm getting annoyied, someone give me a hint please. Thanks
     
  2. jcsd
  3. Feb 12, 2009 #2

    Borek

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    Staff: Mentor

    Re: Gas Law problem.... please help

    What equations have you tried to use?
     
  4. Feb 12, 2009 #3
    Re: Gas Law problem.... please help

    KE= 3/2 RT

    sqrt[3RT/M]

    and KE=(3/2)RT/avo's number
     
  5. Feb 13, 2009 #4
    Re: Gas Law problem.... please help

    Thank-you all for the help.


    I figured it out myself.
     
  6. Feb 14, 2009 #5

    Borek

    User Avatar

    Staff: Mentor

    Re: Gas Law problem.... please help

    Sorry, somehow I missed your previous answer :frown:
     
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