肼(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－1，N2H4(g)＋
O2(g)===N2(g)＋2H2O(g) ΔH＝－534.0 kJ·mol－1，下列表示N2H4(g)跟N2O4(g)
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－1
B．2N2H4(g)＋N2O4(g)===3N2(g)＋4H2O(g) ΔH＝－1 059.3 kJ·mol－1
C．2N2H4(g)＋N2O4(g)===3N2(g)＋4H2O(g) ΔH＝－1 076.7 kJ·mol－1
D．N2H4(g)＋
N2O4(g)===
N2(g)＋2H2O(g) ΔH＝－1 076.7 kJ·mol－1