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在化学计算中,使用一些特殊的化学方程式,常能化繁为简,化难为易,简称特殊方程法。常见的特殊方程有以下几种: 一、待定方程式 特点:某反应物或生成物的分子式是待定的,故化学方程式中含未知数x、y等。 例1.某金属7g和足量盐酸反应,可得氢气2.8L(标准状况),该金属11.2g可和21.3g氯气完全反应生成相应的盐,求该金属
In chemical calculations, some special chemical equations are used, which can often be simplified and simplified. The common special equations are the following: 1. The equation to be determined Characteristic: The molecular formula of a reactant or product is to be determined, so the chemical equation contains the unknown x, y and so on. Example 1. Reaction of 7g of a certain metal with sufficient amount of hydrochloric acid to obtain 2.8L of hydrogen gas (standard condition). 11.2g of the metal can be completely reacted with 21.3g of chlorine gas to produce the corresponding salt.