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化学计算题没有一成不变的解题模式,重要的是要建立解决化学问题的基本思维模式。笔者现对化学计算题常见解题技巧进行归纳解析,供大家参考。一、守恒法1.质量守恒例1.一定量的液态化合物XY_2,在一定量的O_2中恰好完全燃烧,反应方程式为XY_2(液)+3O_2(气)=XO_2(气)+2YO_2(气)。测得生成物的总体积为672 mL,密度为2.56 g/L(标准状况)。(1)反应前O_2的体积为mL。
There is no static model of chemical problem solving problem solving, it is important to establish a basic mode of thinking to solve chemical problems. The author is now a common solution to chemical problem-solving skills summary analysis, for your reference. First, the conservation law 1. Conservation of quality Example 1. A certain amount of liquid compounds XY_2, just a certain amount of O_2 exactly burning, the reaction equation XY_2 (liquid) +3 O_2 (gas) = XO_2 (gas) + 2YO_2 (gas) . The total volume of the product measured was 672 mL and the density was 2.56 g / L (standard condition). (1) The volume of O_2 before reaction is mL.