An ideal aqueous solution of a liquid A with water containing 28% by mass of liquid A (molecular mass = 140) has a vapour pressure of 160 mm Hg at 37°C. Find the vapour pressure of the pure liquid A.

Question

An ideal aqueous solution of a liquid A with water containing 28% by mass of liquid A (molecular mass = 140) has a vapour pressure of 160 mm Hg at 37°C. Find the vapour pressure of the pure liquid A. (The vapour pressure of water at 37°C is 150 mm Hg)

TestHub · Accepted Answer

Solute: n A ​ = 140 28 ​ = 0.2 Solvent: n B ​ = 18 72 ​ = 4 P total ​ = X A ​ P A 0 ​ + X B ​ P B 0 ​ 160 = 4.2 0.2 ​ × P A 0 ​ + 4.2 4 ​ × 150 P A 0 ​ = 360 mm Hg

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JEE Advanced 2027 (Class 12)