a sample of 0.2952 g iron ore is dissolved in acid, and the iron is converted to Fe2+. the sample is then titrated with 47.20 ml of 0.02240 M KMnO4 solution. the oxidation-reduction reaction that occurs during titration is as follows MnO4^-  +  5Fe^2+  +  8H^+  =  Mn^2+  +  5Fe^3+  +  4H2O if the sample had a mass of 0.8890 g, what is the percentage of iron in the sample?

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