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    Mass percentage of sodium chloride in a mixture

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    A sample of a mixture containing only sodium chloride and potassium chloride has a mass of 3.5650g. When this sample is dissolved in water and excess silver nitrate is added, a white precipitate (silver chloride) forms. After filtration and drying, this precipitate has the mass 7.9143g.
    What is the mass percentage of sodium chloride in the mixture?

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    NaCl + AgNO3 -> AgCl(ppt) + NaNO3
    KCl + AgNO3 -> AgCl(ppt) + KNO3
    Atomic wt of Ag = 108
    Atomic wt of Cl = 35.5
    atomic wt of Na = 22
    Atomic wt of K = 39
    molecular wt of AgCl = 108+35.5 = 143.5
    in 143.5 gm of AgCl=> Cl = 35.5 gm
    => in 7.9143 gm of AgCl => Cl = 7.9143*35.5/143.5 = 1.9579 gm
    molecular ...

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    The solution is a step-by-step equation process.