. The vapour pressure of a dilute aqueous solution of glucose

is 750 mm of Hg at 373 K. Calculate mole fraction of the solute :

A: 0.013

B: 0.25

C: 0.968

D: 0.75


Best Answer


The ratio of the number of moles of the solute divided by the total number of moles present in the solution is known as the mole fraction of a solute.

The pressure created by the vapour of a liquid above the surface of the liquid is known as vapour pressure.

The following formula calculates a solute's mole fraction:


This formula is derived from Raoult's law, which states that each component of an ideal mixture of liquids has a partial

pressure equal to the vapour pressure of the pure component multiplied by its mole fraction in the mixture.

The vapour pressure figure stated in the question is 750 mm.


Final answer:

Correct Answer is A)0.013


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