A sample of iron ore weighing 0.6248 g is dissolved in acid, the iron reduced to Fe²⁺, and the solution titrated with 33.60 mL of a 0.1502 N solution of K₂Cr₂O₇. (Fe²⁺ ⟶ Fe³⁺; Cr₂O₇²⁻ ⟶ 2 Cr³⁺). a) Calculate the percentage of iron, Fe (FW 55.847) in the sample. b) Express the percentage as Fe₂O₃ (FW 159.69)

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