**Unformatted text preview: **S From the derivation of Eq. (20.6), , and 1 1 d γ c a γ b T r T T r T--= = and so the argument of the logarithm in the expression for the net entropy change is 1 identically, and the net entropy change is zero. c) The system is not isolated, and a zero change of entropy for an irreversible system is certainly possible....

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