12.63 g sample of calcium ore was dissolved in HCI and gravimetrically analyzed, through the precipitation of calcium into CaC2O4 * H2O The precipitate was filtered. washed, dried, and ignited at 500 degrees C until the weight was constant, giving a final mass of 2.35 grams pure CaCo3 (100.087g /mol) Calculate the % Calcium 140.078g / mol in the sample.

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