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What is the temperature of the gas?

  1. May 7, 2012 #1
    1. The problem statement, all variables and given/known data

    A gas of 8.00×10^19 atoms or molecules has 0.500 J of thermal energy. Its molar specific heat at constant pressure is 20.8 J/mol K.

    2. Relevant equations

    T = 0.5/(N*specific heat)

    3. The attempt at a solution

    I divided 8.00*10^19 by Avogadro's Constant to get the number of moles. Than I did .5/(N*20.8 J/mol K) and got 181 K. But that seems to be incorrect. Anyone know why?
     
  2. jcsd
  3. May 7, 2012 #2

    ehild

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    Why does it seem incorrect?

    Edit: The molar heat at constant pressure is given!

    ehild
     
    Last edited: May 7, 2012
  4. May 7, 2012 #3

    vela

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    You're using the wrong specific heat.
     
  5. May 7, 2012 #4
    What specific heat do I use?
     
  6. May 7, 2012 #5

    ehild

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    Use Cv.

    ehild
     
  7. May 7, 2012 #6
    Wait how do I calculate Cv?
     
  8. May 7, 2012 #7

    vela

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    That's something you need to figure out. The relationship between cp and cv is surely talked about in your textbook.
     
  9. May 7, 2012 #8
    Thanks, I got it now.
     
    Last edited: May 7, 2012
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