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Determine delta S for the conversion of a monatomic ideal gas from state 1 to state 2.

Cv = (3/2)R, Cp = (5/2)R

State 1: V1 = 22.0L, P1 = 1.25atm, T1 = 308K, n=0.917mol

State 2: V2 = 34.0L, P2 = 0.700atm, T2=325K, n=0.917mol

delta S = nR(V2/V1) + nCvln(T2/T1)

From what I can see, the process doesn't look like it's carried out in either constant pressure nor constant volume. If that answer is correct, then why is Cp not used?