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【单选题】
已知2 mol H 2 (g)燃烧生成液态水放出的热量为571．6 lkJ，而2 molH 2 (g)完全燃烧生成气态水放的热量为483． 6 kJ。下列说法正确的是A.
l molH 2 O (I)变成lmolH 2 O (g)，向外界释放能量
B.
1 molH 2 O (g)分解成H 2 (g)和O 2 (g)，吸收241． 8 kJ能量
C.
2 mol H 2 (g)和l mol O 2 (g)的总能量小于2 molH 2 O（1）的能量
D.
断裂2 molH 2 O (g)中所有的O-H键，吸收483． 6 kJ能量
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