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I have to calculate the change in entropy of the gas in each one of the three processes and show that there is no net change in the cyclic process.

O.K. From A to B Delta S is nRln(V2/V1) since the process from A to B is isothermal. Delta S is 0 from B to C since that process occurs adiabatically.

But I am having trouble with the Delta S for the process from C to A. So far I have Delta S is Cv ln(T1/T2) But I'm having trouble converting this to something similar to the Delta S for A to B

Could someone please tell me if I'm on the right track with this problem, and possibly give me a hint