发射“神五”时用肼（N₂H₄）作为火箭发动机的燃料，NO₂为氧化剂，反应生N₂和水
蒸气。已知：N₂(g) + 2O₂(g) = 2NO₂(g)；△H =" +" 67.7kJ/mol。
N₂H₄(g) + O₂(g) = N₂(g) + 2H₂O(g)；△H =" –" 534kJ/mol。
下列关于肼和NO₂反应的热化学方程式中，正确的是

A．2N2H4(g) + 2NO2(g) = 3N2(g) + 4H2O(l)；△H =" –" 1135.7kJ/mol

B．2N2H4(g) + 2NO2(g) = 3N2(g) + 4H2O(g)；△H =" –" 1000.3kJ/mol

C．N2H4(g) + NO2(g) = 3/2N2(g) + 2H2O(l)；△H =" –" 1135.7kJ/mol

D．2N2H4(g) + 2NO2(g) = 3N2(g) + 4H2O(g)；△H =" –" 1135.7kJ/mol