恒温恒压下化学平衡移动的讨论

Discussions on chemical equilibrium movement at constant temperature and constant pressure

利用微分法讨论了恒温恒压下理想气体化学反应达平衡时,某物质的量改变时的平衡移动规律。分析表明:在恒温恒压下,若物种j出现在反应方程式系数总和较大的一侧且其平衡摩尔分数xj大于vj/ivi时,改变理想气体化学平衡系统中j物质的量将导致反常的平衡移动;若物种j不能同时满足上述条件时,改变理想气体化学平衡系统中j物质的量只引起正常的平衡移动。

By means of differentiation, the effect of change of the amount of a species in the system involving ideal gases at equilibrium on equilibrium movement was discussed at constant temperature and constant pressure. It was concluded that at constant temperature and constant pressure, if species j were on one side of larger sum of coefficient of chemical equation and its equilibrium mole fraction xj were more than vj/∑ivi, changing the amount of speciesj in the system at equilibrium would cause abnormal movement of equilibrium, and at constant temperature and constant pressure, if species j didn＇ t satisfy two conditions above simultaneously, changing the amount of species j in the system at equilibrium would cause normal movement of equilibrium.