②H2(g)+ O2(g)=H2O(g)△H=﹣241.8kJ•mol﹣1
③C(s)+ O2(g)=CO(g)△H=﹣110.5kJ•mol﹣1
④C(s)+O2(g)=CO2(g)△H=﹣393.5kJ•mol﹣1 ,
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