one Experiment 5: Redox (Dichromate Titrations) А 0.0423 $ sample of Iror is dissolved in H,POH SO mixture passed over a

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one Experiment 5: Redox (Dichromate Titrations) А 0.0423 $ sample of Iror is dissolved in H,POH SO mixture passed over a reducing agent so that all the iron is in the form Fea. The Fer is completely oxidized by 31.6 mL of a 5.1 x10-6 M Gr.0,- solution Calculate the mass percentage of the iron in the ore? (Fe-55.845 g/mol) Cr,0,2 +6Fe+-+14H-26" + 6Fet- +7H.O a) 44.0 %w/w b) 16.8 %w/w c) 24.3 % w/w d) 12.8 %w/w e) 8.69 %w/w