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物质的量浓度是高中化学的一个重要概念,有关物质的量浓度(简称c_B)的计算是高考的热点内容。下面从六个方面对c_B的命题角度进行归纳,以帮助考生全面掌握。一、考查c_B与质量分数、溶解度的联系例1标准状况下,将aLNH_3溶于1000g水中,得到的氨水溶液的密度为pg/cm~3,求氨水的物质的量浓度是多少? [分析]本题的关键是要辨清溶质和计算溶液的
The concentration of substances is an important concept of high school chemistry. The calculation of the concentration of related substances (referred to as c_B) is a hot content of the college entrance examination. In the following, the c_B propositions are summarized from six perspectives to help candidates acquire a comprehensive grasp. First, examine the relationship between c_B and the mass fraction and solubility. Example 1 Under standard conditions, dissolve aLNH_3 in 1000 g of water. The density of the obtained aqueous ammonia solution is pg/cm~3. What is the concentration of the substance required to obtain ammonia water? [Analysis] The key to this question is to identify the solute and calculate the solution