下列各组热化学方程式中,化学反应的ΔH前者小于后者的是①C(s)+O2(g) ===CO(g);ΔH1 C(s)+O2(g) ===CO2(g);ΔH2②S(g)+O2(g) ===SO2(g);ΔH3 S(s)+O2(g) ===SO2(g);ΔH4③CaO(s)+H2O(l) ===Ca(OH)2(s);ΔH5 CaCO3(s) ===CaO(s)+CO2(g);ΔH6
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