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The vapour pressure of two pure liquids ...

The vapour pressure of two pure liquids A and B which form an ideal solution are 300 and 800 torr, respectively, at temperature T. A liquid solution of A and B for which the mole fraction of A is 0.60 is contained in a cylinder closed by piston on which the pressure can be varied. The solution is slowly vapourized at temperature T by decreasing the applied pressure, starting with a pressure of about 1 atm. Based on this information, answer the following three questions
The pressure of the vapour when the last droplet of liquid remains will be

A

300 torr

B

400 torr

C

500 Torr

D

600 torr

Text Solution

Verified by Experts

The correct Answer is:
B
The pressure of the vapour when the last liquid remains would be `p= x_(A) P_(A)^(@) + x_(B) P_(B)^(@) = (0.80 xx 300 + 0.2 xx 800)` Torr = 400 Torr
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