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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