化学计算题中 ,有一类是要求通过计算确定物质组成的题目 .此类题目中物质的组成通常有几种情况 ,要求同学们在解题时能全面思考 ,去伪存真 ,对物质的组成做出准确的判断 .此类题能较全面地考查同学们分析问题、解决问题的能力 .例 1　将 50g木炭粉与氧化铜粉末组成的混合物放? Among the chemical calculation questions, there is a category that requires the determination of the composition of matter by calculation. The composition of the substances in such topics usually has several situations. It requires the students to think comprehensively when solving a problem, to eliminate falsehoods, and to make accurate composition of matter. Judgment. Such questions can more comprehensively examine the ability of students to analyze problems and solve problems. Example 1 Put a mixture of 50g charcoal powder and copper oxide powder?