题目内容
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我国神舟六号飞船发射时用肼(N2H4)作为火箭发动机的燃料，NO2为氧化剂，反应生成氮气和水蒸气．已知：N2(g)＋2O2(g)＝2NO2(g)△H＝＋67.7kJ昺ol－1，N2H4(g)＋O2(g)＝N2(g)＋2H2O(g)△H＝－534 kJ昺ol－1．关于肼和二氧化氮反应的热化学方程式中正确的是 | |
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A． |
2N2H4(g)＋2NO2(g)＝3N2(g)＋4H2O(l)△H＝－1135.7kJ昺ol－1 |
B． |
2N2H4(g)＋2NO2(g)＝3N2(g)＋4H2O(g)△H＝－1135.7kJ昺ol－1 |
C． |
N2H4(g)＋NO2(g)＝3/2N2(g)＋2H2O(g)△H＝－1135.7kJ昺ol－1 |
D． |
2N2H4(g)＋2NO2(g)＝3N2(g)＋4H2O(g)△H＝＋1135.7kJ昺ol－1 |
答案：B
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