A 0.960 g sample of impure hematite (Fe₂O₃) is treated with 1.752 g of oxalic acid (H₂C₂O₄ · 2 H₂O) in an acidic medium. Following this, the excess oxalic acid is titrated with 35.16 mL of 0.100 M KMnO₄. What is the mass percent of Fe₂O₃ in the impure sample of hematite? The following equations are neither complete nor balanced.

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(1) H₂C₂O4(aq) + Fe₂O3 (2) H₂C₂O4(aq) + MnO4(aq) 2+ Fe²+ (aq) + CO₂(g) 2+ Mn²+ (aq) + CO₂(g)