The unknown sample from Part (a) was found to have a mass of 0.5690 g. The mass of silver chloride that precipitated was 0.8414 g. What is the

The unknown sample from Part (a) was found to have a mass of 0.5690 g. The mass of silver chloride that precipitated was 0.8414 g. What is the percentage chloride in the unknown? (Please give your answer to 4 significant figures)