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由于纯净物的组成是固定的,数量关系也是固定的,且为定值,因而在化学计算中可以根据纯净物的固定组成或化学方程式中有关物质的数量关系,建立起初始物与最终物间简便的关系式。这种用关系式求解的方法就是关系式法,
Since the composition of the pure material is fixed and the quantitative relationship is fixed and fixed, the chemical composition can establish the relationship between the initial material and the final material according to the fixed composition of the pure material or the quantitative relationship of the related substances in the chemical equation. Simple relationship. This method of solving with a relational expression is a relational method.