题目内容
肼(N2H4)是火箭发动机的一种燃料,反应时N2O4为氧化剂,反应生成N2和水蒸气。已知:N2(g) + 2O2(g)=N2O4(g); △H=+ 8.7kJ/molN2H4(g) + O2(g)=N2(g) + 2H2O(g); △H=534 kJ/mol
下列表示肼和N2O4反应的热化学方程式,正确的是
A. 2N2H4(g) + N2O4(g) = 3N2(g) + 4H2O(g); △H=1076.7 kJ/mol
B. N2H4(g) + 1/2N2O4(g) =3/2N2(g) + 2H2O(g); △H=1076.7 kJ/mol
C. 2N2H4(g) + N2O4(g) = 3N2(g) + 4H2O(g); △H=542.7 kJ/mol
D. 2N2H4(g) + N2O4(g) = 3N2(g) + 4H2O(g); △H=1059.3 kJ/mol
A
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