题干
已知下列热化学方程式：
(1) H2(g)＋
O2(g)= H2O(g)；ΔH1=" a" kJ/mol
(2) 2H2(g)＋O2(g)=2H2O(g)；ΔH2=" b" kJ/mol
(3) H2(g)＋O2(g)=H2O(l)；ΔH3=" c" kJ/mol
(4) 2H2(g)＋O2(g)=2H2O(l)；ΔH4=" d" kJ/mol
下列关系式正确的是
(1) H2(g)＋
O2(g)= H2O(g)；ΔH1=" a" kJ/mol (2) 2H2(g)＋O2(g)=2H2O(g)；ΔH2=" b" kJ/mol
(3) H2(g)＋
O2(g)=H2O(l)；ΔH3=" c" kJ/mol (4) 2H2(g)＋O2(g)=2H2O(l)；ΔH4=" d" kJ/mol
下列关系式正确的是
A：a<c<0
B：b>d>0
C：2c=b>0
D：2c=d<0
答案(点此获取答案解析）
D
