n forensic chemistry, the analysis of gunshot residues often involves the detection of lead compounds. If 20 grams of lead carbonate (PbCO3) react with excess hydrochloric acid (HCl) according to the equation: PbCO3 2 HCl → PbCl2 CO2 H2O How many grams of lead chloride (PbCl2) are produced? (Molar mass: PbCl2 = 278 g/mol)