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chemistry

Given the following reactions
Fe2O3(s) + 3CO (s) → 2Fe (s) + 3CO2(g)ΔH
=-28.0 kJ
3Fe (s) + 4CO2(s) → 4CO (g) +Fe3O4(s)
ΔH = +12.5 kJ

the enthalpy of the reaction of
Fe2O3 with CO
3Fe2O3(s) + CO (g) → CO2(g) + 2Fe3O4(s)
is __________ kJ

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