一、中考化学综合计算题的类型1 化学方程式与化学式的综合计算例 1　用足量的一氧化碳还原 0 .4ｇ某种铁的氧化物 ,把生成的二氧化碳通入足量的石灰水中 ,得到干燥沉淀 0 .75ｇ ,试确定这种铁的氧化物的化学式 .分析　首先根据沉淀的量求出二氧化碳的量 ,再根据二氧化碳的量及 First, the type of comprehensive chemistry calculation questions in the chemistry of the exam 1 Comprehensive calculation of the chemical equation and the chemical formula Example 1 Use a sufficient amount of carbon monoxide to reduce 0. 4g of certain iron oxides, and pass the generated carbon dioxide into a sufficient amount of lime water to obtain a dry precipitate. 0.75g, try to determine the chemical formula of this iron oxide. The analysis first determines the amount of carbon dioxide based on the amount of precipitation, and then according to the amount of carbon dioxide and