A 0.500-g sample of steel is analyzed for manganese. The sample is dissolved in acid and the manganese is oxidized to permanganate ion. A measured excess of Fe2+ is added to reduce MnO4 – to Mn2+. The excess Fe2+ is determined by titration with K2Cr2O7. If 75.00 mL of 0.125 M FeSO4 is added and the excess requires 13.50 mL of 0.100 M K2Cr2O7 to oxidize Fe2+, calculate the percent by mass of Mn in the sample.
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