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在化学选择题中,常出现一些反应复杂、数据繁多的计算题。如果循规蹈矩去求算,势必耗费大量时间,而且学生常心烦意乱而半途放弃。在此介绍一种解题妙法——终态求解法。即不管中间过程,只须抓住最终状态,研究最终组成成分,其中有多少阴阳离子?它们之间有何关系?很快建立关系,解决问题,不妨看看下面几例: 例1.在铁和氧化铁混和物15克中,加入稀硫酸150毫升。能放出H_21.68升(S、P、T)。
In chemistry multiple-choice questions, there are often some calculation problems with complex reactions and numerous data. If you follow the rules to calculate, it will inevitably take a lot of time, and students often upset and give up halfway. Here is a solution to the problem - the final solution. That is, regardless of the intermediate process, just grasp the final state, study the final composition, how many anions and cations are there, and what is the relationship between them? To quickly establish the relationship and solve the problem, consider the following examples: Example 1. In iron In 15 g of the iron oxide mixture, 150 ml of dilute sulfuric acid was added. Can release H_21.68 liters (S, P, T).