Chapter 4, Problem 4.91P

The active compound in Pepto-Bismol contains C, H, O, and Bi.

(a) When 0.22105 g of it was burned in excess ${\text{O}}_{\text{2}}$, 0.1422 g of bismuth(III) oxide, 0.1880 g of carbon dioxide, and 0.02750 g of water were formed. What is the empirical formula of this compound?

(b) Given a molar mass of $\text{1086 g/mol,}$ determine the molecular formula.

(c) Complete and balance the acid-base reaction between bismuth(III) hydroxide and salicylic acid $\left({\text{HC}}_{\text{7}}{\text{H}}_{\text{5}}{\text{O}}_{\text{3}}\right),$ which is used to form this compound.

(d) A dose of Pepto-Bismol contains 0.600 mg of active ingredient. If the yield of the reaction in part (c) is 88.0%, what mass (in mg) of bismuth(III) hydroxide is required to prepare one dose?