N₂H₄是一种高效清洁的火箭燃料，0.25 mol N₂H₄(g)完全燃烧生成N₂和气态水放出133.5kJ热量，则下列热化学方程式中正确的是

A．N2H4(g)+O2(g)N2(g)+H2O(g)△H="+267" kJ·mol^－1

B．N2H4(g)+O2(g)N2(g)+2H2O(g)△H=－133.5 kJ·mol^－1

C．N2H4(g)+O2(g)N2(g)+2H2O(l)△H=－534 kJ·mol^－1

D．N2H4(g)+O2(g)N2(g)+2H2O(g)△H=－534 kJ·mol^－1