36 and 38 A 12.63 g sample of calcium ore was dissolved in HCI and gravimetricallyanalyzed, through the precipitation of calcium into CaC204 H20. Theprecipitate was filtered, washed, dried, and ignited at 500 °C until theweight 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.O 16.7%O 7.45%O 15.4%33.4% A 5.70 g iron ore was dissolved in concentrated HCI. After the dissolution,the resulting solution was made basic by adding 6.0 M NAOH slowly untilthe solution is slightly turbid. Urea was then added and the solution washeated for 3 hours. The precipitate was filtered using an ashless filter paperand ignited to form Fe2O3 (159.69 g/mol). The mass of precipitate is 2.1 g.Find the % FegO4 (231.54 g/mol) in the iron ore sample.О 33.4%О 34.0%O 37.7%O 35.6%

Answer: These question are based on the stoichiometric calculation, where by calculation the moles…

A 12.63 g sample of calcium ore was dissolved in HCI and gravimetrically analyzed, through the precipitation of calcium into CaC204 H20. The precipitate was filtered, washed, dried, and ignited at 500 °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. O 16.7% O 7.45% O 15.4% O 33.4%