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A mixture of {\rm NaCl} and {\rm NaBr} has a mass of 2.10{\rm g} and is found to contain 0.71{\rm g} of {\rm Na} What is the mass of {\rm NaBr} in the mixture?

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    Let X = mass NaCl and
    let Y = mass NaBr
    two equation in two unknowns.
    ----------------------

    X + Y = 2.10g
    X(atomic mass Na/molar mass NaCl) + Y(atomic mass Na/molar mass NaBr) = 0.71g

    Solve for X and Y.

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