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The vapour pressure of two liquid P and ...

The vapour pressure of two liquid P and Q are 80 torr and 60 torr respectively. The total vapour pressure obtained by mixing `3` moles of P and 2 mole of Q would be

A

`69=8 "torr"`

B

`20 "torr"`

C

`140 "torr"`

D

`72 "torr"`

Text Solution

Verified by Experts

The correct Answer is:
D
`P_(M) = P_(1)^(@).X_(1)+P_(2)^(@).X_(2)`
`= 80 xx (3)/(3+2)+60 xx (2)/(3+2) = 72 "torr"`
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