题目

称取铁矿石0.2000g,经处理后,用0.00833mol/LK2Cr2O7标准溶液滴定,耗去25.20ml,则矿石中Fe2O3的质量分数为()(M(Fe2O3)=159.7g/mol)A. 30.28%B. 40.28%C. 50.28%D. 60.28%

称取铁矿石0.2000g,经处理后,用0.00833mol/LK2Cr2O7标准溶液滴定,耗去25.20ml,则矿石中Fe2O3的质量分数为(){M(Fe2O3)=159.7g/mol}

A. 30.28%

B. 40.28%

C. 50.28%

D. 60.28%

题目解答

答案

C. 50.28%