Solve Isentropic Expansion: Mass 0.45 kg, 10 bar, 622°C to 331°C, 85 kJ Work

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Homework Statement


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?


Homework Equations





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..?
 
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