温度为T
1时,在三个容积均为1L的恒容密闭容器中均发生反应:
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmtext%3E2%3C%2Fmtext%3E%3Cmtext%3EN%3C%2Fmtext%3E%3Cmsub%3E%3Cmrow%3E%3Cmtext%3EO%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E2%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmtext%3E%28%3C%2Fmtext%3E%3Cmtext%3Eg%3C%2Fmtext%3E%3Cmtext%3E%29%3C%2Fmtext%3E%3Cmunderover%3E%3Cmo%3E%E2%87%8C%3C%2Fmo%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3C%2Fmrow%3E%3C%2Fmunderover%3E%3Cmtext%3E2%3C%2Fmtext%3E%3Cmtext%3EN%3C%2Fmtext%3E%3Cmtext%3EO%3C%2Fmtext%3E%3Cmtext%3E%28%3C%2Fmtext%3E%3Cmtext%3Eg%3C%2Fmtext%3E%3Cmtext%3E%29%3C%2Fmtext%3E%3Cmtext%3E%2B%3C%2Fmtext%3E%3Cmsub%3E%3Cmrow%3E%3Cmtext%3EO%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E2%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmtext%3E%28%3C%2Fmtext%3E%3Cmtext%3Eg%3C%2Fmtext%3E%3Cmtext%3E%29%3C%2Fmtext%3E%3C%2Fmath%3E)
(正反应吸热)。实验测得:v
正=v(NO
2)
消耗=k
正c
2(NO
2),v
逆=v(NO)
消耗=2v(O
2)
消耗=k
逆c
2(NO)·c(O
2),k
正、k
逆为速率常数,受温度影响。
容器编号 | 物质的起始浓度(mol/L) | 物质的平衡浓度(mol/L) |
c(NO2) | c(NO) | c(O2) | c(O2) |
I | 0.6 | 0 | 0 | 0.2 |
II | 0.3 | 0.5 | 0.2 | |
III | 0 | 0.6 | 0.35 | |
下列说法正确的是( )
- A、容器II达到平衡前v正>v逆
- B、达到平衡时,容器III中NO的体积分数大于50%
- C、设K为该反应的化学平衡常数,则有
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmtext%3EK%3C%2Fmtext%3E%3Cmtext%3E%3D%3C%2Fmtext%3E%3Cmfrac%3E%3Cmrow%3E%3Cmsub%3E%3Cmrow%3E%3Cmtext%3Ek%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E%E9%80%86%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmsub%3E%3Cmrow%3E%3Cmtext%3Ek%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmtext%3E%E6%AD%A3%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3C%2Fmrow%3E%3C%2Fmfrac%3E%3C%2Fmath%3E)
- D、当温度改变为T2时,若
, 则
>1.25