3. Find the % content of MnO2 in pyrolusite if a 153.0 mg sample is treated with 30 ml of 0.1075 N oxalic acid solution and dilute sulfuric acid. The remainder of the oxalic acid requires 5.31 ml of KMnO4 solution for titration, 1 ml of which is equivalent to 1.025 ml of H2C2O4

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