iven the following reactions,

Fe2O3 (s) + 3CO (s) 2Fe (s) + 3CO2 (g) H = -28.0 kJ

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

the enthalpy of the reaction of Fe2O3 with CO (below) is _____________ kJ.

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