题目列表(包括答案和解析)
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=+8.7 kJ·mol-1 N2H4(g)+O2(g)=N2(g)+2H2O(g);△H=-534.0 kJ·mol-1 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-1 |
B. |
2N2H4(g)+N2O4(g)=3N2(g)+4H2O(g);△H=-1059.3 kJ·mol-1 |
C. |
N2H4(g)+N2O4(g)=N2(g)+2H2O(g);△H=-1076.7 kJ·mol-1 |
D. |
2N2H4(g)+N2O4(g)=3N2(g)+4H2O(g);△H=-1076.7 kJ.mol-1 |
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)+N2O4(g)=N2(g)+2H2O(g);△H=-1076.7kJ/mol |
1―5 CADAA 6―10 ACBDA 11―15 CDBCC 16―
18.AB 19.AC 20.BD
21.(1)①B ②BDF ③偏小
(2)①酒精灯
②在干燥器中冷却是为了防止空气中的H2O影响结果
③
④偏高
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