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

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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)