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A 6.00 g sample contained Fe(3)O(4), Fe(...

A `6.00` g sample contained `Fe_(3)O_(4), Fe_(2)O_(3)` , and inert materials. It was treated with an excess of aqueous Kl in acidic medium which reduced all the iron to `Fe^(2+)`. The resulting solution was diluted to 50 ml . and a 10 ml sample of it was taken . The liberated iodine reacts with `5.5` ml. of 1 M `Na_(2)S_(2)O_(3)` solution, yielding `S_(4)O_(6)^(2-)` . The iodine from another 25 ml . sample was extracted , after which the `Fe^(2+)` was titrated with `3.2` ml of 1 M `MnO_(4) " in " MnO_(4)^(-)` solution .
Calculate the percentage of `Fe_(3)O_(4)" and " Fe_(2)O_(3)` in the original mixture.

Text Solution

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The correct Answer is:
`24.67%`
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