利用化学方程式进行计算,是利用质量守恒原理解决相关物质的质量及其比例关系计算的有效方法。但是不少同学在计算时常会犯各种各样的错误。现就常见的计算错误例析如下,供大家参考。一、没有弄清题意解题时要注意反应物是否反应完全,参加反应的药品是否有作催化剂的,催化剂不能作为列比例式计算的依据。例1实验室用H_2还原200gCuO,加热一段时间后,冷却称量残 The use of chemical equations for calculation is the use of conservation of mass principle to solve the quality of the material and the relationship between the effective way to calculate. But many students often make a variety of mistakes in the calculation. The common calculation error is as follows, for your reference. First, did not understand the problem solving problem should pay attention to the reaction is complete, whether the reaction of the drug as a catalyst, the catalyst can not be used as a basis for column-based calculations. Example 1 Laboratory H_2 reduction 200gCuO, heating for a period of time, cooled weighing residue