UncategorizedThe density of 2 M aqueous solution of NaOH is 1.28 g/cm3. The molality of the solution is [Given that molecular mass of NaOH = 40 g mol-1]

The density of 2 M aqueous solution of NaOH is 1.28 g/cm3. The molality of the solution is [Given that molecular mass of NaOH = 40 g mol-1]

  1. A

    1.32 m

  2. B

    1.20 m

  3. C

    1.67 m

  4. D

    1.20 m

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    Solution:

    Let, volume of solution = 1 litre
    Mole of NaOH = 2
    Mass of NaOH solution = 1000 × 1.28 = 1280 g
    Mass of H2O = (1280 – 2 × 40) = 1200 g = 1.2 kg

     Molality (m)= Mole of NaOH Mass of solvent (kg)

    =21.2=1.67 m

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