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At 25^(@)C, the vapour pressure of pure ...

At `25^(@)C`, the vapour pressure of pure liquid A (mol. Mas = 40) is 100 torr and that of pure Liquid B is 40 torr, (mol. mass = 80). The vapour pressure at `25^(@)C` of a solution containing 20 g of each A and B is :

A

80 torr

B

`59.8 t o rr`

C

`68 t o rr`

D

48 torr

Text Solution

Verified by Experts

The correct Answer is:
1
Moles of A `=(20)/(40)rArr0.5,`
Moles of B `=(20)/(80)rArr0.25,`
`X_(A)=(0.5)/(0.5+0.25)=0.67,X_(B)=0.33`
`P_("total")=P_(A)^(@)X_(A)+P_(B)^(@)X_(B)`
`rArr" "100xx0.67+40xx0.33rArr80`torr
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