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Homework Help: Is my answer correct for finding the change in entropy?

  1. Aug 10, 2012 #1
    I am not sure if my work is correct so I need your help to confirm it.

    Question:
    Find the change in entropy when:

    n mol of ideal gas (ɣ=7/5) is reversibly compressed until the pressure is three times the ideal gas at constant temperature.

    My answer:
    S=n Cv ln(T2/T1) + nR ln(V2/V1)

    as temperature is constant so

    S=nR ln(V2/V1)
    V2/V1=1/3
     
  2. jcsd
  3. Aug 10, 2012 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    Look right to me.

    AM
     
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