题目列表(包括答案和解析)
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=-1 059.3 kJ·mol-1
C.N2H4(g)+N2O4(g) N2(g)+2H2O(g) ΔH=-1 076.7 kJ·mol-1
D.2N2H4(g)+N2O4(g) 3N2(g)+4H2O(g) ΔH=-1 076.7 kJ·mol-1
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.N2H4(g)+N2O4(g)=N2(g)+2H2O(g)ΔH="-1076.7" kJ·mol-1 |
D.2N2H4(g)+N2O4(g)=3N2(g)+4H2O(g)ΔH="-1076.7" kJ·mol-1 |
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.N2H4(g)+N2O4(g)=N2(g)+2H2O(g)ΔH="-1076.7" kJ·mol-1
D.2N2H4(g)+N2O4(g)=3N2(g)+4H2O(g)ΔH="-1076.7" kJ·mol-1
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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