The iron content of iron ore can be determined by titration with a standard KMnO4 solution. The iron ore is dissolved in HCl, and all the iron is reduced to Fe2+ ions. This solution is then titrated with KMn04 solution, producing Fe3+ and Mn2+ ions in acidic solution. Ifit required 38.37 mL of 0.0198 M KMnO4 to titrate a solution made from 0.6128 g of iron ore, what is the mass percent of iron in the iron ore?

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