Use the following information to calculate ΔH∘
in kilojoules for the water-gas reaction:
C(s)+O2(g)→CO2(g)
ΔH∘=−393.5kJ

2CO(g)+O2(g)→2CO2(g)
ΔH∘=−566.0kJ

2H2(g)+O2(g)→2H2O(g)
ΔH∘=−483.6kJ