摘要：9． 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 = 2H2O H = -571.6lkJ·molˉl D．H2(g)+O 2(g) = H2O(1) H = +285.8kJ·molˉl
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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 |
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 = 2H2O
H = —571.6lkJ·molˉl
D．H2(g)+
O 2(g) = H2O(1) H = +285.8kJ·molˉl
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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 = 2H2O
H =
—571.6lkJ·molˉl
D．H2(g)+
O
2(g) = H2O(1) H =
+285.8kJ·molˉl
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H =" " —142.9kJ·molˉl
O 2(g) = H2O(1)
H = —142.9kJ·molˉl
O 2(g) = H2O(1)