Chem

what mass of NaCl is contained in 24.88g of a 15% by mass solution of NaCl in water?

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  1. 15% by mass means 15 g in 100 g solution. We can use the above and convert to 24.88 g if you wish OR
    I think the easiest way to do this is to substitute into the equation for percent mass.

    method 1.
    15g x (24.88/100) = approx 3,7g

    method 2.
    (X g solute/g solution)*100 = %
    (X/24.88)*100 = 15
    Solve for X and I obtained approx 3.7

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