A 5.63 g sample of calcium ore was dissolved in HCl and gravimetrically analyzed, through the precipitation of calcium into CaC₂O₄ · H₂O. The precipitate was filtered, washed, dried and ignited at 500 deg C until the weight was constant, giving a final mass of 2.35 grams pure CaCO₃ (100.087 g/mol).
Calculate the % Calcium (40.078 g/mol) in the sample.

Group of answer choices

33.4%

41.7%

16.7%

25.4%