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The Molar Specific Heat (internal energy)

  1. Sep 4, 2009 #1
    1. The problem statement, all variables and given/known data
    One mole of an ideal diatomic gas undergoes a transition from. a to c along the diagonal path
    What is the change in internal energy?

    2. Relevant equations



    3. The attempt at a solution

    I've tried to use the two other paths since the internal energy is the same both ways, but I cant see anyway to reconcile the two.
     

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  2. jcsd
  3. Sep 4, 2009 #2

    Redbelly98

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    What is the equation for internal energy of an ideal gas, in terms of its temperature?
     
  4. Sep 4, 2009 #3
    [tex]\Delta[/tex]U=n*Cv*[tex]\Delta[/tex]T
     
  5. Sep 4, 2009 #4

    Redbelly98

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    You can use that equation to solve this problem. You just need:

    1. the temperature change between points a and c
    2. Cv
    3. n
     
  6. Sep 4, 2009 #5
    I figured it out... but now I need to find the work done and the total heat entered into the system. I know it has to do with
    U=Q-W

    and the use of the other path(ABC).
     
  7. Sep 4, 2009 #6

    Redbelly98

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    Yes, you'll need that equation (U=Q-W). You can also use the fact that W is the area under the curve in the P-V diagram.
     
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