题目内容

1g H2燃烧生成液态水放出142.9kJ的热量,下列热化学方程式正确的是
A.2H2(g)+ O 2(g) = 2H2O(1)H = —142.9kJ·molˉl
B.2H2(g)+ O 2(g) = 2H2O(1)H = —571.6kJ·molˉl
C.2H2+O2 = 2H2OH = —571.6lkJ·molˉl
D.H2(g)+O 2(g) = H2O(1)H = +285.8kJ·molˉl
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