Twenty dietary iron tablets with a total mass of 22.131 g were ground and mixed

Chapter 26, Problem 26-18

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Twenty dietary iron tablets with a total mass of 22.131 g were ground and mixed thoroughly. Then 2.998 g of the powder were dissolved in HNO3 and heated to convert all iron into Fe3. Addition of NH3 precipitated Fe2O3 xH2O, which was ignited to give 0.264 g of Fe2O3 (FM 159.69). What is the average mass of FeSO4 7H2O (FM 278.01) in each tablet?

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