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Polytropic Process of Nitrogen

  1. May 21, 2015 #1
    1. The problem statement, all variables and given/known data
    Nitrogen at 100°C and 600 kPa expands in such a way it can be approximated by a polytropic process with n=1.2. Calculate the work and the heat transfer if the final pressure is 100 kPa.

    2. Relevant equations

    3. The attempt at a solution
    I used the equation T2/T1=(P2/P1)^[(n-1)/n] to find T2. Then i used W=nCv(T1-T2) to calculate work done. Is this correct? But i don't know how to calculate the heat transfer.
  2. jcsd
  3. May 21, 2015 #2
    No. This is not the work. This is the change in internal energy. To get the work, you need to integrate PdV.
    If you know the change in internal energy and the work, then you can use the first law to get the heat.

  4. May 21, 2015 #3
    Hi, does that mean I have to find V1 and V2 first?
  5. May 21, 2015 #4
    That's one way to start.

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