$\Delta \mathrm{G}_{\mathrm{f}}^{0}$ and $\Delta \mathrm{H}_{\mathrm{f}}^{0}$ for $\mathrm{Fe}(\mathrm{g})$ are $370.7 \mathrm{kJ} \mathrm{mol}^{-1}$ and $416.3 \mathrm{kJ} \mathrm{mol}^{-1}$ at 298 K , respectively. Assuming $\Delta \mathrm{H}_{\mathrm{f}}^{0}$ is constant in the interval 250 K to 375 K, $\Delta \mathrm{G}_{\mathrm{f}}^{0}$ (rounded off to the nearest integer) for $\mathrm{Fe}(\mathrm{g})$ at 375 K is:
(a)$338 \mathrm{kJ} \mathrm{mol}^{-1}$
(b)$310 \mathrm{kJ} \mathrm{mol}^{-1}$
(c)$325 \mathrm{kJ} \mathrm{mol}^{-1}$
(d)$359 \mathrm{kJ} \mathrm{mol}^{-1}$
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.