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28 April, 04:41

if the mole fractio of NaCl in an aqueous solution is 0.0927, what is the wt/wt% (percent by mass) of NaCl

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  1. 28 April, 05:06
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    mole NaCl = 0.0927

    mole H2O = 1.0000 - 0.0927 = 0.9073

    then

    mass NaCl = 0.0927mole x (0.9073g / mole) = 0.1022 g

    mass H2O = 0.9073 mole x (18.02g / mole) = 16.35 g

    and therefore;

    mass % NaCl = [ (0.1022g NaCl) / (58.45g NaCl + 18.016g H2O) ] x 100% = 24.9%

    =24.9%
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