A 1. 362 g ample of an iron ore that contained Fe3O4 wa diolved in acid and all of the iron wa reduced to Fe2. The olution wa then acidified with H2SO4 and titrated with 39. 42 mL of 0. 0281 M KMnO4, which oxidized the iron to Fe3. The net ionic equation for the reaction i 5Fe2 MnO4- 8H h 5Fe3 Mn2 4H2O (a) What wa the percentage by ma of iron in the ore? (b) What wa the percentage by ma of Fe3O4 in the ore?
