The standard enthalpy of formation of $\mathrm{FeO}$ and ${\mathrm{Fe}}_2{\mathrm{O}}_3$ is $-65\text{ kcal }{\mathrm{mol}}^{-1}$' and $-197\text{ kcal }{\mathrm{mol}}^{-1}$ respectively. A mixture of two oxides contains  $\mathrm{FeO}$ and ${\mathrm{Fe}}_2{\mathrm{O}}_3$ in the mole ratio 2 : 1: If by oxidation, it is changed into a 1 : 2 mole ratio mixture, how much of thermal energy will be released per mole of the initial mixture?