(Answered) A sample that weighs 0.1586 grams contains only sodium

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A sample that weighs 0.1586 grams contains only sodium chloride and potassium chloride was dissolved in water. It took 22.90 mL of 0.1000 AgNO3 to precipitate all of the chloride present. What is the composition by mass percents of the 0.1586 g original sample? Also what is the formula?

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