The chemical reaction aA+bB cC+dD has the entropychange S 1 at T 1 and S 2 at T

Question

The chemical reaction aA+bB cC+dD has the entropychange S1 at T1 and S2at T2 . The heat capacities of the reactants, aA+bB, isCp (R). The heat capacity of the products, cC+dD, isCp (O). All the reactants and products are condensedphases. Develop an expression for the entropy at T2.Assume the heat capacities are independent of temperature. (a) S2 =S1 +Cploge (T2 /T1)                     (b) Cp (P)=Cp (R)+(H2-H1 )T    (c) Cv(P)=Cv (R)+(H2 -H1)T                                      (d)S2 =S1-Cp loge (T2 /T1)

Explanation / Answer

Answer: (c) Cv (P)=Cv(R)+(H2 -H1 )T

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