molal fraction

例句：

1. 1. The experiment was designed to determine the molar fraction of oxygen in the sample.
   这个实验旨在确定样品中氧气的摩尔分数。
2. 2. In chemical analysis, molar fractions are used to calculate the concentration of solutes in a solution.
   在化学分析中，摩尔分数用于计算溶液中溶质的浓度。
3. 3.The molar fraction of water in this mixture is 0.5, which means half of the substance is water.
   混合物中水摩尔分数为0.5，这意味着物质的一半是水。