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    21．N2H4是一种高效清洁的火箭燃料.0.25 mol N2H4(g)完全燃烧生成氮气和气态水时.放出133.5 kJ热量.则下列热化学方程中正确的是 A．1/2 N2H4(g)+ 1/2 O2(g)＝ 1/2 N2(g)+ H2O(l) △H = +257kJ·mol-1 B．N2H4(g)+O2(g)＝N2(g)+2H2O(l) △H = -133.5kJ·mol-1 C．N2H4(g)+O2(g)＝N2(g)+2H2O(g) △H = +534kJ·mol-1 D．N2H4(g)+O2(g)＝N2(g)+2H2O(g) △H = -534kJ·mol-1 【查看更多】

     

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    N2H4是一种高效清洁的火箭燃料。0.25 mol N2H4(g)完全燃烧生成氮气和气态水时，放出133.5 kJ热量。则下列热化学方程式中正确的是(    )

    A.N2H4(g)+O2 (g)====N2 (g)+ H2O (g)；ΔH=+267kJ／mol

    B.N2H4(g)+O2 (g)+====N2(g)+2H2O (g)；ΔH=-133.5 kJ／mol

    C.N2H4(g)+O2 (g)==== N2 (g)+2H2O (g)；ΔH=+534 kJ／mol

    D.N2H4(g)+O2 (g)==== N2 (g)+2H2O (g)；ΔH=-534 kJ／mol

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    N2H4是一种高效清洁的火箭燃料。0.25 mol N2H4(g)完全燃烧生成氮气和气态水时，放出133.5 kJ热量。则下列热化学方程式中正确的是(　　)

    A．1/2 N2H4(g)＋1/2O2(g)===1/2 N2(g)＋H2O(g) ΔH＝＋267 kJ·mol－1

    B．N2H4(g)＋O2(g)===N2(g)＋2H2O(l) ΔH＝－133.5 kJ·mol－1

    C．N2H4(g)＋O2(g)===N2(g)＋2H2O(g) ΔH＝＋534 kJ·mol－1

    D．N2H4(g)＋O2(g)===N2(g)＋2H2O(g) ΔH＝－534 kJ·mol－1

     

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    N2H4是一种高效清洁的火箭燃料。0.25 mol N2H4(g)完全燃烧生成氮气和气态水时，

    放出133.5 kJ热量。则下列热化学方程式中正确的是(    )

    A．N2H4(g)＋O2(g)====N2(g)＋H2O(g)；ΔH=＋267 kJ·mol－1

    B．N2H4(g)＋O2(g)====N2(g)＋2H2O(g)；ΔH =－534 kJ·mol－1

    C．N2H4(g)＋O2(g)====N2(g)＋2H2O(g)；ΔH =＋534 kJ·mol－1

    D．N2H4(g)＋O2(g)====N2(g)＋2H2O(l)；ΔH =－133.5 kJ·mol－1

     

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    N2H4是一种高效清洁的火箭燃料。0.25 mol N2H4(g)完全燃烧生成氮气和气态水时，放出133.5 kJ热量 。则下列热化学方程式中正确的是(　　)

    A．N2H4(g)＋O2(g)===N2(g)＋2H2O(g)   ΔH＝＋267 kJ·mol－1

    B．N2H4(g)＋O2(g)===N2(g)＋2H2O(g)   ΔH＝－534 kJ·mol－1

    C．N2H4(g)＋O2(g)===N2(g)＋2H2O(g)   ΔH＝＋534 kJ·mol－1

    D．N2H4(g)＋O2(g)===N2(g)＋2H2O(l)   ΔH＝－133.5 kJ·mol－1

     

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    N2H4是一种高效清洁的火箭燃料。0.25 mol N2H4(g)完全燃烧生成氮气和气态水时，放出133.5 kJ热量。则下列热化学方程式中正确的是

    A．N2H4(g)＋O2(g)===N2(g)＋H2O(g)  ΔH＝＋267 kJ·mol－1

    B．N2H4(g)＋O2(g)===N2(g)＋2H2O(l)  ΔH＝－133.5 kJ·mol－1

    C．N2H4(g)＋O2(g)===N2(g)＋2H2O(g)  ΔH＝＋534 kJ·mol－1

    D．N2H4(g)＋O2(g)===N2(g)＋2H2O(g)  ΔH＝－534 kJ·mol－1

     

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