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Homework Help: Isentropic Expansion

  1. Nov 26, 2008 #1
    1. The problem statement, all variables and given/known data
    A mass of 0.45 kg of a perfect gas with a ratio of specific heats of 1.41 expands isentropically by means of a reversible non-flow process from an initial pressure of 10 bar and temperature 622oC to a temperature of 331 oC whilst generating 85 kJ of work. The specific heat at constant volume in J/kgK for the gas is?

    2. Relevant equations

    3. The attempt at a solution
    I really have no idea where to start. I have attended all of my lectures and read all of the notes, but I just do no know where to come at this problem from..?
  2. jcsd
  3. Nov 28, 2008 #2
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