1. A sample of 0.1602 g of limestone was dissolved in hydrochloric acid, after which Ca2 was precipitated in the form of calcium oxalate CaC2O4. The washed precipitate was dissolved in dilute sulfuric acid and titrated with 20.75 ml of KMnO4 solution, the titer of which for CaCO3 is 0.006020 g/ml. Calculate the mass fraction of CaCO3 in limestone.
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