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90g of silver coin was dissolved in stro...

90g of silver coin was dissolved in strong nitric acid, and excess of sodium chloride solution was added. The silver chloride precipitate was dried and weighed 71.75 g. Caculate the percentage of silver in the coin (Atomic mass of Ag = 108 )
`Ag + 2HNO_(3) to AgNO_(3) + NO_(2) + H_(2)O`
`AgNO(3) + NaCl to AgCl + NaNO_(3)`

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