已知在发射卫星时可用肼(N₂H₄)为燃料和NO₂作氧化剂，两者反应生成N₂和水蒸气。
又知：N₂(g)＋2O₂(g)===2NO₂(g)          　 ΔH＝＋67.7kJ·mol^－1
N₂H₄(g)＋O₂(g)===N₂(g)＋2H₂O(g)     ΔH＝－534kJ·mol^－1
则肼与NO₂反应的热化学方程式为（       ）

A．N2H4(g)＋NO2(g)===3/2N2(g)＋2H2O(g) ΔH＝＋567.85kJ·mol^－^1

B．N2H4(g)＋NO2(g)===3/2N2(g)＋2H2O(g) ΔH＝－567.85kJ·mol^－^1

C．N2H4(g)＋NO2(g)===3/2N2(g)＋2H2O(l) ΔH＝＋567.85kJ·mol^－^1

D．N2H4(g)＋NO2(g)===3/2N2(g)＋2H2O(l) ΔH＝－567.85kJ·mol^－^1