Chapter 4, Problem 4.17PAE

4.17 Phosgene is a highly toxic gas that has been used as a chemical weapon at times in the past. It is now used in the manufacture of polycarbonates, which are used to make phone cases and plastic eyeglass lenses. Phosgene is produced by the reaction, $\text{CO }+{\text{ Cl}}_{\text{2}}\to {\text{COCl}}_{\text{2}}$ . Given an excess of carbon monoxide, what mass of chlorine gas must be reacted to form 4.5 g of phosgene?