题目内容：

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