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The vapour pressure of two liquids 'P' a...

The vapour pressure of two liquids 'P' and 'Q' are 80 and 60 torr respectively. The total vapour pressure of solution obtained by mixing 3 mol of P and 2 mol of Q would be

A

72 torr

B

140 torr

C

68 torr

D

20 torr

Text Solution

Verified by Experts

The correct Answer is:
A
`x(P)=(3)/(3+2)=0.6`
`x(Q)=(2)/(3+2)=0.4`
p (total) `=p(P)+p(Q)`
`=80xx 0.6 + 60 xx 0.4`
`=48+24=72` torr
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