单选题 较易0.85 引用5 组卷171
化学反应N2(g)+3H2(g)===2NH3(l)的能量变化如图所示,则该反应的ΔH等于 ( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/303c280b-d4a3-4168-9de1-aad8231721ed.png?resizew=296)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/303c280b-d4a3-4168-9de1-aad8231721ed.png?resizew=296)
A.2(a-b-c) kJ·mol-1 | B.-2(b-a) kJ·mol-1 |
C.- (b+c-a) kJ·mol-1 | D.(a+b) kJ·mol![]() |
18-19高一下·内蒙古通辽·期末
类题推荐
已知H—H、H—O和O
O键的键能分别为436 kJ·mol-1、463 kJ·mol-1和495 kJ·mol-1,下列热化学方程式正确的是
![](https://img.xkw.com/dksih/QBM/2017/10/16/1796538605625344/1800138964140032/STEM/dcabbfd090b04d63a9afbbc1aa17cfb6.png?resizew=14)
A.H2O(g)![]() |
B.H2O(g)![]() |
C.2H2(g)+O2(g)![]() |
D.2H2(g)+O2(g)![]() |
已知化学反应A2(g)+B2(g)===2AB(s)的能量变化如图所示,判断下列叙述中错误的是
![](https://img.xkw.com/dksih/QBM/2015/12/28/1576233165266944/1576233165389824/STEM/523b8b5a4a29495382a6a4da0d137586.png)
![](https://img.xkw.com/dksih/QBM/2015/12/28/1576233165266944/1576233165389824/STEM/523b8b5a4a29495382a6a4da0d137586.png)
A.该反应热ΔH=+(a-b)kJ·mol-1 |
B.AB(s)=== A(g)+B(g) ΔH=+b/2kJ·mol-1 |
C.断裂1 mol A-A键和1 mol B-B键,吸收a kJ能量 |
D.该反应在任何条件下都不可能自发进行 |
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