本法将整个混合物当作一种平均相对分子质量为 M的平均组分，根据混合物各组分中所含某元素的化合价数或某原子或离子的个数 n，建立一种通过式关系，求出 M/n值，再与各组分的 M/n值比较，根据平均值法则进行比较，即可得出结论。 例一，把含有某一氯化物杂质的氯化镁粉末 95 This method will be the entire mixture as an average relative molecular mass of M average component, according to the composition of each component contained in the valence of a certain element or a number of atoms or ions n, to establish a through the relationship, Find the M / n value, and then compared with the M / n value of each component, according to the average rule to compare, you can draw conclusions. Example 1, the chloride containing some chloride impurities 95 powder