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在根据化学方程式的计算中,有时题目给的条件不是某种反应物或生成物的质量,而是反应前后某种参照物的差值,解决此类问题用差量法进行计算十分简便。差量指一个过程中某参照物的始态量与终态量的差值。与“差量”有关的计算就称为差量法。化学反应中各量(可以是质量、气相物质的体积、压强,也可以是物质的量、反应过程中的热量)之间的关系成比例,因而其差量也成比例。
In the calculation according to the chemical equation, sometimes the problem is not given the quality of a reactant or product, but the difference between a reference before and after the reaction, to solve such problems calculated by the difference method is very simple. The difference refers to the difference between the initial state quantity and the final state quantity of a reference object in a process. The calculation related to “Difference ” is called Difference Method. The amount of chemical reaction (which can be mass, volume of gas phase material, pressure, it can also be the amount of material, the heat during the reaction) is proportional to the relationship between the amount is also proportional to the difference.