①C(s)+O2(g)═CO2(g);ΔH1 C(s)+O2(g)═CO(g);ΔH2
②S(s)+O2(g)═SO2(g);ΔH3 S(g)+O2(g)═SO2(g);ΔH4
③H2(g)+O2(g)═H2O(l);ΔH5 2H2(g)+O2(g)═2H2O(l);ΔH6
④CaCO3(s)═CaO(s)+CO2(g);ΔH7 CaO(s)+H2O(l)═Ca(OH)2(s);ΔH8
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