在学习化学知识的过程中,我们常会遇到出现反应物的质量有余量或不完全分解的情况。这类题大部分问题较为明显,但也有一些题目的隐含条件,需经分析有关数据才能清楚,有些同学由于挖掘不出这一隐含条件而导致错解。本文略举三例,旨在使同学们对挖掘隐含条件的有关方法有所了解。 In the process of learning chemical knowledge, we often encounter the situation that the quality of the reactants has excess or incomplete decomposition. Most of these questions are more obvious, but there are also implicit conditions for some topics that need to be analyzed to understand the relevant data. Some students may have misunderstood because they cannot find out the hidden conditions. This article gives a brief overview of three cases. It aims to make students understand the relevant methods of mining hidden conditions.