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Question: limonite an ore of iron is dissolved into solution and...

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Limonite, an ore of iron is dissolved into solution and titrated with potassium permanganate, KMnO4. It is found that 1.225g sample of limonite requires 40.0 ml of 0.0253M KMnO4for complete reaction.

What is the percentage of iron in the limonite sample? 

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