Answer:

molality is the number of moles of the solvent present in 1kg of the solvent..

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1 mole of solution contains 0.25 mol of methanol and 1 – 0.25 = 0.75 mol of water.

Mass of water = 0.75 x 18 = 13.5

Molality of methanol solution

=> Moles of Methanol/ Mass of solvent x 1000 0.25/13.5 x 100

=> 18.5 m