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溶质的质量分数计算是近几年初中化学竞赛及各省、市中考中的热点试题。同学们失分较多。原因是对溶质的质量分数概念理解不透。下面就几道典型的此类计算题的解法进行错解剖析，希望能起到一点参考的作用。例1将50克胆矾溶于150克水中，求所得溶液中溶质的质量分数。错解由于
The calculation of the mass fraction of solute is a hot topic in the junior high school chemistry competition and the provincial and city examinations in recent years. Students lose more points. The reason is that the concept of the mass fraction of solute is not understood. Below a few typical calculations of such calculation problems are analyzed and analyzed in the hope that they can serve as a reference. Example 1 50 g of cholesterol was dissolved in 150 g of water to obtain the mass fraction of the solute in the resulting solution. Misunderstanding