Question

Given the following reactions

Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g) ΔH = −28.0 kJ

3Fe(s) + 4CO2(g) → 4CO(g) + Fe3O4(s) ΔH = +12.5 kJ

3 Fe2O3(s) + CO(g) → CO2(g) + 2 Fe3O4(s)

the enthalpy of the reaction of Fe2O3 with CO is which of the following?

-59.0 kJ

-109 kJ

-15.5 kJ

+109 kJ