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物质的量浓度是化学计算的一个重要内容．化学计算需要以基本概念、基本理论为基础,其核心是思维方法和计算方法的掌握．提高化学计算能力的必经途径是进行变式演练,它要求对相关的计算问题进行基本分类,继而开展拓展性、深化性的练习与总结．物质的量浓度计算的基本类型主要有2种,文中称为题根1和题根2,题根1是关于物质的物质的量浓度的计算,它基于物质的量浓度的正确理解和直接应用;题根2是物质的量浓度在化学反应中的应用,它需要利用物质的量浓度来统摄多种物质之间的反应的量的关系．同学们利用本文提供的题根与变式演练,将能巩固和提升物质的量浓度的计算技能．
The amount of material concentration is an important part of stoichiometry. Chemical calculation needs to be based on basic concepts and basic theories, and its core is the mastery of thinking methods and calculation methods. The only way to improve the capacity of chemical calculation is to carry out a variant exercise, which requires the basic classification of related calculation problems, followed by extensive and deepening exercises and conclusions. Substance concentration calculation of the basic types are mainly two, the paper referred to as the title root 1 and title root 2, the title root 1 is the calculation of the amount of material substance concentration, which is based on the correct understanding of the amount of substance concentration and direct application ; Taken 2 is the application of the amount of substance concentration in chemical reactions, it needs to use the amount of substance concentration to measure the relationship between the amount of the reaction between multiple substances. Students use the questions and variations provided in this article exercises, will be able to consolidate and enhance the computational skills of the concentration of substances.