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Is this how we represent entropy?

  1. Apr 20, 2015 #1
    1. The problem statement, all variables and given/known data
    The question says:
    In a process involving n moles of an ideal gas , what is the entropy change of the system ?

    2. Relevant equations
    ΔS=qrev/T=(ΔU-w)/T
    (I have used the chemistry's equation of 1st law of thermodynamics which has the -ve sign)

    3. The attempt at a solution
    The answer given is that:
    nCvln(T2/T1)+nRln(V2/V1).
    I don't know how they are giving this answer. The second term seems to be originated from work done in isothermal conditions . But its not given that the process is an isothermal one. And the first term ...huh..I don't know where it came from. So what is the origin of this answer?
     
  2. jcsd
  3. Apr 20, 2015 #2

    Borek

    User Avatar

    Staff: Mentor

    What process?
     
  4. Apr 20, 2015 #3
    There is nothing else given in the question.
     
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