Iron ores often involve a mixture of oxides and contain both Fe²⁺ and Fe³⁺ ions. Such an ore can be analyzed for its iron content by dissolving it in acidic solution, reducing all the iron to Fe²⁺ ions, and then titrating with a standard solution of potassium permanganate. In the resulting solution, MnO₄^– is reduced to Mn²⁺, and Fe²⁺ is oxidized to Fe³⁺. A sample of iron ore weighing 0.3500 g was dissolved in acidic solution, and all the iron was reduced to Fe²⁺. Then the solution was titrated with a 1.621 × 10^–2 M KMnO₄ solution. The titration required 41.56 mL of the permanganate solution to reach the light purple (pink) endpoint. Determine the mass percent of iron in the iron ore.