The enthalpies of formation of \( \mathrm{FeO}(\mathrm{s}) \) and \( \mathrm{Fe}_{2} \mathrm{O}_... VIDEO
The enthalpies of formation of \( \mathrm{FeO}(\mathrm{s}) \) and \( \mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s}) \) are \( -65.0 \) and \( -197.0 \) kcal/mol, respectively. A mixture of the two oxides contains \( \mathrm{FeO} \) and \( \mathrm{Fe}_{2} \mathrm{O}_{3} \) in the mole ratio \( 2: 1 \). If by oxidation it is changed in to a \( 1: 2 \) mole ratio mixture, then how much of thermal energy will be released per mole of the initial mixture?
(a) \( 13.4 \mathrm{kcal} \)
(b) \( 67 \mathrm{kcal} \)
(c) \( 47.2 \mathrm{kcal} \)
(d) \( 81 \mathrm{kcal} \)
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