摘要： 1g H2燃烧生成液态水.放出142.9kJ热量.表示该反应的热化学方程式为 ( ) A. H2+1/2O2==H2O,△H= -142.9kJ/mol B. H2(g) + 1/2O2(g)==H2O(l),△H= -285.8kJ/mol C. 2H2(g) +O2(g) ==2H2O(l),△H= -142.9kJ/mol D.2H2(g)+ O2(g)==2H2O(l),△H= +571.6kJ/mol
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1g氢气燃烧生成液态水，放出142.9KJ热量，下列表示该反应的热化学方程式正确的是
[ ]
A．H2(g)＋
O2(g)
H2O(l) △H＝－285.8kJ/mol
B．2H2(g)＋O2(g)2H2O(l) △H＝－142.9kJ/mol
C．2H2＋O2H2O △H＝－571.6kJ/mol
D．2H2(g)＋O2(g)2H2O(l) △H＝＋571.6kJ/mol
1g氢气燃烧生成液态水，放出142.9kJ热量，下列表示该反应的热化学方程式正确的是
[ ]
A．2H2(g)＋O2(g)＝2H2O(l)；ΔH＝－142.9kJ·mol－1
B．H2(g)＋
O2(g)＝H2O(l)；ΔH＝－285.8kJ·mol－1
C．2H2(g)＋O2＝2H2O(l)；ΔH＝－571.6kJ·mol－1
D．2H2(g)＋O2(g)＝2H2O(l)；ΔH＝＋571.6kJ·mol－1
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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 |
H = —142.9kJ·molˉl
O 2(g) = H2O(1) 
H =
—142.9kJ·molˉl
O
2(g) = H2O(1)