A solution is an equimolar mixture of two volatile components A and B. Pure A ha

Question

A solution is an equimolar mixture of two volatile components A and B. Pure A has a vapor pressure of 50 torr and pure B has a vapor pressure of 100 torr. The vapor pressure of the mixture is 68 torr.

What can you conclude about the relative strengths of the intermolecular forces between particles of A and B (relative to those between particles of A and those between particles of B)?

The intermolecular forces between particles A and B are stronger than those between particles of A and those between particles of B. The intermolecular forces between particles A and B are weaker than those between particles of A and those between particles of B. The intermolecular forces between particles A and B are the same as those between particles of A and those between particles of B. Nothing can be concluded about the relative strengths of intermolecular forces from this observation.

Explanation / Answer

the vapour pressure of A = 50 torr

the vapour pressure of B = 100 torr

less vapour pressure means more attraction between the particles that's why they are not converting into the vapours

the solution has the vapour pressure = 68 Torr

so, A--A > A--B > B--B

order of attraction between the molecules

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