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    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 【查看更多】

     

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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

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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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    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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    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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