5. A weighing of 0.8545 g of limestone is dissolved in acid and then treated with oxalate at the appropriate pH. The CaC2O4 precipitate is washed and dissolved in acid. The resulting solution was diluted with water to the mark in the volumetric flask at 250.00 cm3. Titration of 25.00 cm3 of this solution consumes 13.45 cm3 of KMnO4 solution with CH=0.1205. What percentage of CaCO3 did the sample contain?

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