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7 February, 10:22

What is the molality of a solution containing 15.0g NaCl dissolved in 50.0g water?

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  1. 7 February, 13:16
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    Hey there!

    Molar mass NaCl = 58.44 g/mol

    number of moles:

    n = m / mm

    n = 15.0 / 58.44

    n = 0.2566 moles of NaCl

    Volume in Kg:

    50.0 g / 1000 = > 0.05 Kg

    Therefore:

    Molality = moles of solute / volume

    Molatity = 0.2566 / 0.05

    Molality = 5.132 mol/kg
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