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5.5 g of a mixture of FeSO4 .7H2O and Fe2(SO4)3 . 9H2O required 5.4 mL of 0.1 N KMnO4 solution for complete oxidation. Calculate the moles of hydrated ferric sulphate in the mixture.

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Best answer

Mn7+O4- → Mn+2 (charge transfered 5 electrons)

Therefore weight of Fe2(SO4)3 · 9H2O = 5.5 - 0.150 g = 5.350 g

Moles of Fe2(SO4)3 · 9H2O = 5.350 / 562 

= 9.5 x 10–3 mole

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