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在计算题教学中,常常遇到两种物质反应后的产物中的一种物质及反应物中一种物质都能与另外同一种物质反应的问题。传统解法是分步计算,要进行过量讨论,显得十分麻烦。有时数据给的不当,那就烦中加难,造成计算结果误差过大。对此,介绍一种简便而准确度很高的解题方法。 例1.将m克铁粉与n克硫粉均匀混合,在密闭容器中加热至红热,冷却后,加入多少毫升b摩/升盐酸就不再产生气体?若把已放出的的气体收集起来,在标准状况下的体积为
In the teaching of computational problems, it is common to encounter the problem of one substance in the reaction of two substances and the reaction of one substance in the reaction with another substance in the same substance. The traditional solution is a step-by-step calculation. Too much discussion is very troublesome. Sometimes the data is not properly given, which makes it bothersome and inaccurate, resulting in an error in the calculation result. In this regard, a simple and highly accurate problem solving method is introduced. Example 1. Uniformly mix m grams of iron powder with ng of sulfur powder and heat it in a closed container until it is red hot. After cooling, how many milliliters of methane/liter of hydrochloric acid do you add? No more gas is generated? If the gas has been collected, collect it. Up, the volume under standard conditions is