A Solid Laboratory Sample Contains Two Substances, Lead(II)carbonate and Barium

A solid laboratory sample contains two substances, lead(II) carbonate and barium carbonate. A 5.000 g sample of this unknown was treated with aqueous nitric acid to dissolve it, then, after further treatment to adjust the acidity, it was treated with an excess of potassium chromate solution. The precipitate which formed, when dried carefully and weighed, has a mass of 6.276 grams. Calculate the percent, by weight, of lead(II) carbonate in this laboratory sample. Hint: Remember to apply the solubility rules when determining the precipitate.

A) 34.60 %
B) 38.42 %
C) 45.91 %
D) 52.93 %
E) 67.38 %