1.
(2016高一下·乐清期中)
肼(N2H4)是火箭发动机的一种燃料,反应时N2O4为氧化剂,生成N2和H2O(g),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反应的热化学反应方程式,正确的是( )
A . 2N2H4(g)+N2O4(g)═3N2(g)+4H2O(g);△H=﹣542.7 kJ/mol
B . 2N2H4(g)+N2O4(g)═3N2(g)+4H2O(g);△H=﹣1059.3 kJ/mol
C . N2H4(g)+ N2O4(g)═ N2(g)+2H2O(g);△H=﹣1076.7 kJ/mol
D . 2N2H4(g)+N2O4(g)═3N2(g)+4H2O(g);△H=﹣1076.7 kJ/mol