①H2O(l) = H2(g)+ O2(g) ∆H=+285.8 kJ·mol-1
②H2O(g) = H2(g)+ O2(g) ∆H=+241.8 kJ·mol-1
③C(s)+ O2(g) = CO(g) ∆H=-110.5 kJ·mol-1
④C(s)+O2(g) = CO2(g) ∆H=-393.5 kJ·mol-1
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