A Chemist collected a 0.4891-g sample of an ore for Fe determination by a redox titration with K2Cr2O7. The ore was carefully crushed prior to weighing and dissolved in HCl and using a Jones reductor the iron in the sample was brought into the +2 oxidation state. After titration with diphenylamine sulfonic acid,it required 36.92 mL of 0.02153 M K2Cr2O7 to reach the end point. Calculate the iron content of the ore as %w/w Fe2O3

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