Chemistry question!!!!!

Question

A sample of a mixture containing only sodium chloride and potassium chloride has a mass of 4.000 g. When this sample is dissolved in water and excess silver nitrate is added, a white solid (silver chloride) forms. After filtration and drying, the solid silver chloride has the mass 9.2142 g. Calculate the mass percent of each mixture component.

Answer 1

Moles AgCl = 9.2142 g/ 143.32 g/mol =0.06429

let x = mass NaCl and let y = mass KCl

x + y = 4.000

x / 58.4428 + y / 74.553 = 0.06429

Solve this system