肼(N2H4)是火箭发动机的一种燃料,反应时N2O4为氧化剂,生成N2和水蒸气。已知:
N2(g)+2O2(g)====N2O4(g) ΔH="+8.7" kJ·mol-1
N2H4(g)+O2(g) ====N2(g)+2H2O(g) ΔH="-534.0" kJ·mol-1
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)ΔH="-542.7" kJ·mol-1 |
B.2N2H4(g)+N2O4(g) ====3N2(g)+4H2O(g)ΔH="-1059.3" kJ·mol-1 |
C.2N2H4(g)+ N2O4(g) ====3N2(g)+4H2O(g)ΔH="-2153.4" kJ·mol-1 |
D.2N2H4(g)+N2O4(g) ====3N2(g)+4H2O(g)ΔH="-1076.7" kJ·mol-1 |