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Calculate the percent purity of a sample of impure H2C2O4*2H2O if .4006 grams of this material requires a titration with 28.62mL of a KMnO4 solution, 1.000 mL of which contains 5.980mg of KMnO4.
2MnO4- + 5H2C2O4 + 6H+ -------------> 2Mn++ + 10CO2 + 8H2O

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