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有关混和物组成的计算,是中学化学教学要求学生必须掌握的一项基本技能.在历年高考题和各地会考试题中均有这类试题出现.现结合实例用不同的方法进行分类解答.一、十字交叉法(杠杆原理法)若知混和物总量(总质量或总的物质的量)和混和物的另一个化学量(如平均密度,分子量、参与反应后产物的量),可用此法解答.
The calculation of composition of blends is a basic skill that students must possess in chemistry teaching in middle school. There are such questions appearing in the college entrance exam questions and examination questions of various localities. Now we use different methods to classify and answer the examples. Cross-cut method (lever principle method) If one knows the total amount of the mixture (the total mass or the total amount of substances) and the other chemical amount of the mixture (such as the average density, the molecular weight, and the amount of products involved in the reaction), this method can be used. answer.