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抽象分析法应用于化学计算中,可使问题变得明了,有利于学生理解,有助于更好地解决问题．试就溶液中有关溶解度、溶质质量分数的计算举例说明如下．一、加入或析出物质不带结晶水例1 60℃恒温条件下,200g物质A的溶液蒸发掉20g水后,能析出10gA的无水晶体,若继续蒸去20g水后,又析出20gA的无水晶体,则物质A在60℃时的溶解度为()．
The use of abstract analysis in chemical calculations can make the problem clear, help students understand and help solve problems better. The example of calculating the solubility and solute mass fraction in the solution is as follows. 1. Adding or Precipitating Substances without Crystal Water Example 1 Under a constant temperature of 60°C, after evaporating 20 g of water from a solution of 200 g of substance A, 10 g of anhydrous crystals can be precipitated. If 20 g of water is further distilled off, 20 g of anhydrous crystals are precipitated again. The solubility of substance A at 60°C is ().