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Q. The vapour pressure of the solution $M$ is

IIT JEEIIT JEE 2008Solutions

Solution:

Vapour pressure $= p (H_2O) + p$ (ethanol)
$ =32.8 \times 0.1 +40 \times 0.9$
$ = 3.28 + 36$
$ = 39.28 \,mm$