有关溶液中溶质质量分数的计算是初中化学计算的重点内容之一.在学习中,绝大部分同学对溶质质量分数的计算公式能牢牢掌握,但在应用中对“溶质质量”“溶液质量”认识不清,甚至部分学习较好的“尖子生”也时常犯错.为了便于同学们在化学总复习中突破难点,现择几例进行难点剖析, The calculation of the solute mass fraction in the solution is one of the key contents of junior high school chemistry calculation. During the study, most students can firmly grasp the formula for calculating the solute mass fraction, but in the application, the “solute quality” and “solution quality “Unclear, even some of the best-studied” top students "also often make mistakes. In order to facilitate the students to break through the difficulties in the total review of the chemistry, we now select a few cases to analyze the difficulties.