chem problem

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JohnDoeDDS

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What percentage of iron is present in the ore, if a 1.120g sample require 25.00ml of .05M KMnO4 to fully oxidize all of the dissolved Fe2+?

8H+ + 5Fe2+ + MnO4- --> 5Fe3+ + Mn2+ + 4H2O

Can you guys explain also please. I have a feeling its an easy question but I'm not understanding it for some reason. Thanks.
 
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