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当可逆反应达到平衡时,不少教科书和教学参考书采用化学动力学中的反应速度表达式——质量作用定律来推导属于化学热力学范畴的平衡常数表达式。例如合成氨反应的平衡常数表达式,在有些书中是这样推导的:对于可逆反应 3H_2+N_2(?)2NH_2根据质量作用定律,其正反应和逆反应的速度表达式分别为:
When the reversible reaction reaches equilibrium, many textbooks and teaching reference books use the expression of the reaction speed in chemical kinetics—the law of mass action to derive the expression of equilibrium constants belonging to the category of chemical thermodynamics. For example, the expression of the equilibrium constant for ammonia synthesis is deduced in some books: For the reversible reaction 3H_2+N_2(?)2NH_2 according to the mass action law, the speed expressions of the positive and negative reactions are: