A 1.362 g sample of an iron ore that contained Fe_3O_4 was dissolved in acid?
moles MnO4- 0.03942 L x 0.0281 M0.001108 moles Fe2+ 5 x 0.0011080.005538 mass Fe2+ 0.005538 x 55.847 g/mol0.3093 g % Fe2+ 0.3093 x 100/ 1.362 22.71 moles Fe3O4 0.005538/3 0.001846 mass Fe3O4 0.001846 x 231.537 g/mol0.4274 g % Fe3O4 0.4274 x 100/ 1.36231.38
