Twenty dietary iron tablets with a total mass of 21.232g were ground and moxed thoroughly. Then 2.898g of the powder were dissolved in HNO3 and heated to convert all iron into Fe3+. Additional NH3 precipitated Fe2O3*xH2O which was ignited to give 0.256g of Fe2O3 (molecular weight 159.69g/mol). What is the average mass of FeSO4*7H2O (molecular weight 278.01g/mol) in each tablet?
13. Twenty dietary iron tablets with a total mass of 21.232 g were ground and mixed thoroughly. Then 2.898 g of the powder were dissolved in HNOs and heated to convert all iron into Fe" Additional of NH3 precipitated Fe2O3·xH20 which was ignited to give 0.256 g of Fe2O3 (molecular weight 159.69 g/mol). What is the average mass of FeSO4 . 7H2O (molecular weight 278.01 g/mol) in each tablet? (12 pts)
