已知1g火箭燃料肼（N₂H₄）气体燃烧生成N₂和H₂O（g）时，放出16.7kJ的热量，则该反应的热化学方程式正确的是(   )

A．N2H4+O2=N2+2H2O△H= —534.4kJ/mol

B．N2H4(g)+ O2(g)=N2(g)+2H2O(g)△H = —16.7kJ/mol

C．N2H4(g)+O2(g)=N2(g)+2H2O(l)△H = —534.4kJ/mol

D．N2H4(g)+O2(g)=N2(g)+2H2O(g)△H = —534.4kJ/mol