A 750.0-mg sample of iron ore was dissolved in acid and treated to oxidize all the iron to ferric ion. After destroying any remaining oxidizing agent, excess KI was added. The liberated I2 required 28.50 mL of 0.07500 M Na2S2O3 for titration. What is the % w/w Fe in the sample? The reactions involved for this titration are the following: 2Fe3+ + I- → 2Fe2+ + I2 I2 + 2S2O32- → 2I- + S4O62-

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A: ANSWER IS DISCUSSED BELOW

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