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

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

A

80 torr

B

59.8 torr

C

68 torr

D

48 torr

Text Solution

Verified by Experts

The correct Answer is:
A
Moles of `A=(20)/(40) rArr 0.5,`
Moles of `B=(20)/(80) rArr 0.25`
`x_(A) =(0.5)/(0.5+0.25)=0.67, x_(B) =0.33`
`P_("total")=P_(A)^(0)X_(A)+P_(B)^(0)X_(B)`
`rArr 100xx0.67 +40xx0.33 rArr 80` torr
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