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The mole fraction of liquid A in a binar...

The mole fraction of liquid A in a binary liquid solution of A (vapour pressure `p_(A)= 300` Torr) and B (Vapour pressure, `p_(B)=800` Torr) is 0.6. The external pressure on this is slowly reduced from 760 Torr. The pressure at which first bubble of vapour appears and the mole fraction of A in this vapour, respectively, are

A

400Torr and 0.24

B

500 Torr and 0.50

C

500 Torr and 0.36

D

600 Torr and 0.25

Text Solution

Verified by Experts

The correct Answer is:
C
The pressure at which first bubble of vapour is formed will be `p= x_(A) P_(A)^(@) = (0.6)` (300 Torr) + (0.4) (800Torr)= 500 Torr
The composition of this vapour will be `y_(A)= (x_(A) p_(A))/(P)= ((0.6) (300" Torr"))/((500"Torr"))= 0.36`
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