A 1262 mg sample of a compound containing copper and chlorine was dissolved in 500. mL of water. Lead(II) nitrate was added to precipitate out all the chlorine as lead(II) chloride (PbCl2).  The precipitate was found to have a mass of 2294 mg.  What mass of chlorine was in the original compound sample?  (the net ionic equation is 2 Cl1-  +  Pb2+  PbCl2)  Convert grams PbCl2 to moles PbCl2 to moles Cl- then get grams of Cl​