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1.
(2021高二上·大兴期中)
已知:25℃、101kPa时,1g H2完全燃烧生成液态水放出142.9kJ的热量,下列热化学方程式中书写正确的是( )
A . 2H2(g) + O2(g) = 2H2O(l) ΔH = -142.9kJ/mol
B . H2(g)+O2(g)= H2O(l) ΔH = -285.8kJ/mol
C . 2H2(g) + O2(g) = 2H2O(g) ΔH = -571.6kJ/mol
D . H2(g) +O2(g) = H2O(g) ΔH = +285.8kJ/mol
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