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根据化学平衡理论,要达到某一化学平衡状态,初始时可以只加一定量的反应物或只加一定量的生成物,也可以同时加入一定量的反应物和生成物。要从已知的平衡状态求出初始状态时所加入物质间的数量关系,就要借助数学方法,结合化学知识,把化学问题抽象成数学问题。现从反应式前后气体物质分子数是否相等的角度来进行归类分析。有关这类问题的题目都与气体物质参加的可逆反应有关,以有关的化学方程式中反应前后气体分子数是否相等可把这类问题分成两类:一是反应前后气体分子数相等的反应;二是反应前后气体分子数不相等的反应。
According to the chemical equilibrium theory, in order to achieve a certain chemical equilibrium, only a certain amount of reactants or only a certain amount of products may be added at the beginning, and a certain amount of reactants and products may also be added at the same time. To find the quantitative relationship between the substances added when the initial state is known from the known equilibrium, it is necessary to use mathematical methods and chemical knowledge to abstract the chemical problems into mathematical problems. The classification analysis is performed from the perspective of whether the number of molecular gas molecules before and after the reaction is equal. The questions related to this type of problem are all related to the reversible reaction of gas substances. The number of gas molecules before and after the reaction in the relevant chemical equations can be divided into two categories: First, reactions with equal numbers of gas molecules before and after the reaction; It is a reaction that the number of gas molecules is not equal before and after the reaction.