化学计算题，一般是比较容易解答的。沮有的题目是“曲径通幽”，这样的题，只要审清题意，往往答错率不高。还有的题容易做错，其原因是，有的同学做题时只注意题目中的强刺激，忽视题目中的弱刺激，导致出现错误。【例】向50克含氢元素9．7％的硫酸接的水溶液中，加入多少克? Chemical calculation questions are generally easier to answer. There is a problem with the “quiet path”, such questions, as long as the review of the meaning of the question, often false answer rate is not high. Another problem is that it is easy to make mistakes. The reason is that some students only pay attention to the strong stimuli in the subject while ignoring the weak stimuli in the title and causing errors. [Example] How many grams is added to 50 g of a 9.7% sulfuric acid solution containing hydrogen?