12. Solution to Chemistry Problem

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1. When analyzing a 0.260 g sample of dolomite, a precipitate of calcium oxalate CaC2O4 was isolated, for titration of which (after its dissolution in sulfuric acid) 20.4 ml of a KMnO4 solution with an iron titer of 0.0150 g/ml was used. Determine the mass fraction of CaCO3 in dolomite.
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