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Two moles of a liquid A(P(A)^(@) = 100" ...

Two moles of a liquid `A(P_(A)^(@) = 100" torr")` and 3 moles of liquid `(B) ( P_(B)^(@)= 150 "torr")` form a solution having vapour pressure os 120 torr. Based upoin this observation which of the following is correct ?

A

Interactions between like molecules `gt` those between unlike molecules

B

Interactions between like molecules `lt` those between unlike molecules

C

Interaction between like molecules = those between unlike molecules

D

Nothing can be concluded.

Text Solution

Verified by Experts

The correct Answer is:
b
Mole fraction of `A=2/(2+3)=0.40` Mole fraction of `B=3/(2+3)=0.60`
Accordiing to Raoult's Law
` P=P_(A)^(@)x_(A)+P_(B)^(@)X_(B)`
`P=(100"torr"xx0.4)+(150"torr"xx0.6)`
=(40+90)=130 torr
Scine the observed vapour pressure (120 torr) is samller that the calculated value of value of vapour pressure, this means that interactions `(A-B)gt(A-A)"and"(B-B)` interactions In other words, solution exhibits nagative deviations from Raoult's Law.
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