肼(N₂H₄)是火箭发动机的一种燃料，反应时N₂O₄为氧化剂，生成N₂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^-1

B．2N2H4(g)+N2O4(g) ====3N2(g)+4H2O(g)ΔH="-1059.3" kJ·mol^-1

C．2N2H4(g)+ N2O4(g) ====3N2(g)+4H2O(g)ΔH="-2153.4" kJ·mol^-1

D．2N2H4(g)+N2O4(g) ====3N2(g)+4H2O(g)ΔH="-1076.7" kJ·mol^-1