Assuming that, since the physical states do not change, the values of ?H and ?S

Question

Assuming that, since the physical states do not change, the values of ?H and ?S do not change as we raise the temperature in the reaction below. Using the following values at 298 K
CdO(s), ?Hof = -258.2 kJ mol-1, So = +54.8 J mol-1 K-1

CdSO4 (s), ?Hof = -933.5 kJ mol-1, So = +123 J mol-1 K-1
SO3 (g), ?Hof = -396 kJ mol-1, So = +256 J mol-1 K-1
calculate a value for the free energy change, ?GT for the reaction, CdSO4 (s) ? CdO(s) + SO3(g) at 750 K
A. +223.3 kJ
B. +138.5 kJ
C. +296.0 kJ
D. +420.5 kJ
E. all the above
F. none of the above

Explanation / Answer

A. +223.3 kJ

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