已知:煤气化反应为C(s) + H2O(g) = CO(g)+H2(g) ΔH
① C(s)+O2(g) = CO2(g) ΔH1=-393.5 kJ/mol
② CO(g)+ O2(g) = CO2(g) ΔH2=-283.0 kJ/mol
③ H2(g)+ O2(g) = H2O(g) ΔH3=-242.0 kJ/mol