题干
下列各组热化学方程式程中，化学反应的△H前者大于后者的是( )
①C(s)＋O2(g)＝CO2(g)；△H1 C(s)＋1/2O2 (g)＝CO(g)；△H2
②S(s)＋O2(g)＝SO2(g)；△H3 S(g)＋O2(g)＝SO2(g)；△H4
③H2(g)＋1/2O2(g)＝H2O(l)；△H5 2H2(g)＋O2(g)＝2H2O(l)；△H6
④CaCO3(s)＝CaO(s)＋CO2(g)；△H7 CaO(s)＋H2O(l)＝Ca(OH)2(s)；△H8
A：①
B：④
C：②③④
D：①②③
答案(点此获取答案解析）
C
