肼(N2H4)是火箭发动机的燃料,反应时N2O4为氧化剂,生成氮气和水蒸气。已知:
N2(g)+2O2(g)=N2O4(g);△H=+8.7kJ/mol
N2H4(g)+O2(g)=N2(g)+2H2O(g);△H=-534.0kJ/mol
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);△H=-542.7kJ/mol |
B.2N2H4(g)+N2O4(g)=3N2(g)+4H2O(g);△H=-1059.3kJ/mol |
C.2N2H4(g)+N2O4(g)=3N2(g)+4H2O(g);△H=-1076.7kJ/mol |
D.N2H4(g)+1/2N2O4(g)=3/2N2(g)+2H2O(g);△H=-1076.7kJ/mol |