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2.0 g of a sample containing NaCl, NaBr ...

2.0 g of a sample containing `NaCl,` `NaBr` and some inert impurity is dissolved in enough water and treated with excess of `AgNO_(3)` solution. A 3.0g of precipitate was formed. Precipitate on shaking with aqueous `NaBr` gains 0.76 g of weight. Determine mass percentage of `NaCl` in the original sample.

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