The standard enthalpy of formation of and is and respectively

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

The standard enthalpy of formation of

\text{FeO}

and

\text{Fe}_2\text{O}_3

-65 \text{ kcal mol}^{-1}

and

-197 \text{ kcal mol}^{-1}

respectively. If a mixture containing

\text{FeO}

and

\text{Fe}_2\text{O}_3

2:1

mole ratio on oxidation is changed into

1:2

mole ratio, how much of thermal energy will be released per mole of the initial mixture?