Please, i need your help in this problem. How do i solve it.?

1) a mixture of NaCl and BaCl2.2H2O is 42.39% sodium chloride by m. 5.893g of this mixture are dissolved in 100ml of water. When a sodium phosphate is added a white precipitate forms. The sodium phosphate is added until no more precipitate is formed. What is the m of this precipitate.