An unknown ionic compound containing only cr and was analyzed using gravimetric analysis. The Cl unknown compound was dissolved in water. Pb?" ions were added to the solution (by addition of Pb(NOs)), causing all of the cl in the unknown compound to precipitate out as PbC2 (s). In an experiment a 152.40 milligram sample of the unknown compound was dissolved in solution, and 401.47 milligrams of Pbclz were collected. a Find the mol of Cl in the sample of the unknown compound. b) Recalling that the unknown compound contains only cr and Cl, find the mass of Cr in the unknown compound c) Find the empirical formula of the unknown compound
