题目

．(N2H4)是火箭发动机的燃料，它与N2O4反应时，N2O4为氧化剂，生成氮气和水蒸气。                     已知：N2(g)＋2O2(g)===N2O4(g) ΔH＝＋8.7 kJ/mol， N2H4(g)＋O2(g)===N2(g)＋2H2O(g)ΔH＝－534.0 kJ/mol， 下列表示肼跟N2O4反应的热化学方程式，正确的是( )   A．2N2H4(g)＋N2O4(g)===3N2(g) ＋4H2O(g)ΔH＝－542.7 kJ/mol   B．2N2H4(g)＋N2O4(g)=== 3N2 (g)＋4H2O (g)ΔH＝－1059.3 kJ/mol   C．2N2H4(g)＋N2O4(g)=== 3N2 (g)＋4H2O (g)ΔH＝－1076.7 kJ/mol   D．N2H4(g)＋12N2O4(g)=== 3N2 (g)＋4H2O (g)ΔH＝－1073．□÷35=21…□，当余数最大时，被除数是769．