If the iron in a 0.1500-gram sample of iron ore is reduced and subsequently requires 15.03 ml of permanganate for  oxidation, what is the purity of the ore expressed as percentage of  Fe2O3? 4.000 mL KMnO4 is equivalent to 3.000 mL KHC2O4.H2C2O4 solution (as a reducing agent) and equivalent to  3.000 mL 0.1000 N NaOH (as an acid)

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