Calculating m of silver nitrate.....?

Silver chloride us very insoluble in water, and by adding a very slight excess of silver nitrate, it is possible effectively to remove all the chloride ion from the sample. First, write the balanced net ionic equation for this reaction. Then ume that a sample has a m of 1.054 grams contains 21.5% chloride ion by m. Then calculate the m of silver nitrate that be used to completely precipitate all the chloride from the sample?