Gravimetric Analysis-- Questions I am in first-year Chemistry in university and I can't seem to find the answers for two questions from my course work. I have tried many times, and I keep reading the textbook but I still can't get it. Please help if you know the correct answers. Thank you. Here are the questions: 1.) A compound of Iron and Chlorine is soluble in water. An excess of Silver Nitrate was added to precipitate the chloride ion as silver chloride. If a 134.8 mg sample of the compound gave 304.8 mg of AgCl, what is the formula of the compound? 2.) Determine the oxidation number of HgCr2O7. Thank you.