SolutionHard

Question

The vapour pressure of water at room temperature is lowered by 5% by dissolving a solute in it, then the approximate molality of solution is :

Options

A.2
B.1
C.4
D.3

Solution

= 0.05 = XB
Where XB = mole fraction of solute.
Molality = = 1000 × 0.05 / 0.95 × 18 = 2.92 ≈ 3.0

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