3. From a limestone weighing 0.1862 g, dissolved in HCl, (Ca)2+ ions were precipitated in the form of calcium oxalate. The washed precipitate was dissolved in dilute sulfuric acid, and the resulting oxalic acid was titrated with 22.15 ml of a potassium permanganate solution with a potassium permanganate titer of calcium carbonate equal to 0.005820 g/ml. Calculate the mass fraction (%) of calcium in limestone.

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