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高中化学有关确定气态物质分子式这类计算题所涉及的概念较多,题目变化较大,计算繁杂,使学生不易理解掌握。而这类计算题的习惯解法是先求组份元素的原子个数比而算出最简式,再通过分子量求算出分子式。能否用较为简便的方法来解这类题呢?根据质量守恒定律:“在化学反应中,物质的性质改变了,但质量不改变。”我们若用摩尔这一概念来解这类题,则可取到简化计算过程、易于理解而直接求出分子式的效果。试看下列例题:
There are many concepts involved in the calculation of high school chemistry related to the determination of molecular formulas of gaseous substances. The topics vary greatly and the calculations are complicated, making it difficult for students to understand and grasp. The customary solution to this kind of calculation problem is to find the simplest formula by first finding the ratio of the atomic number of the constituent elements, and then calculate the molecular formula by the molecular weight. Can we solve this kind of problem with a relatively simple method? According to the law of conservation of mass: “In the chemical reaction, the nature of the material changes, but the quality does not change.” If we use the concept of Moore to solve such problems, It can be used to simplify the calculation process, easy to understand and directly calculate the effect of the molecular formula. Take a look at the following examples: