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A salt unknown containing ferrous ion was dissolved and diluted to 250.0 mL. A 25.00 mL aliquot of the ferrous ion solution was titrated with

A salt unknown containing ferrous ion was dissolved and diluted to 250.0 mL. A 25.00 mL aliquot of the ferrous ion solution was titrated with 0.1386 M potassium permanganate solution, and the mean of three acceptable, corrected titrations volumes was 27.68 mL. Calculate the mass of iron in the 250.0 mL solution. Give your answer to 4 places after the decimal. Do not enter units.

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