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，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)＋N2O4(g)===N2(g)＋2H2O(g)ΔH＝－1076.7 kJ/mol