Question

The vapour pressures of pure liquids A and B
respectively are 600 torr and 500 torr. In a
binary solution of A and B, mole fraction of A is
0.25 then total pressure of the solution (in torr)
will be
625
530
525
575​

Answer 1

Answer:

heres the answer , 535 torr

Explanation:

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Answer 2

Given info : The vapour pressures of pure liquids A and B respectively are 600 torr and 500 torr. In a binary solution of A and B, mole fraction of A is

0.25.

To find : The total pressure of the solution will be ...

solution : vapor pressure of pure liquid A, $P^0_A$ = 600 torr

mole fraction of A, $x_A$ = 0.25

so pressure of liquid A in solution is P , $P_A$ = vapor pressure of pure liquid A × mole fraction of A

= $P^0_A\times x_A$

= 600 torr × 0.25 = 150 torr

similarly, vapor pressure of pure liquid B, $P^0_B$ = 500 torr

mole fraction of B, $x_B$ = 1 - $x_A$ = 1 - 0.25 = 0.75

so pressure of liquid B in solution is P , $P_B$ = vapor pressure of pure liquid B × mole fraction of B

= $P^0_B\times x_B$

= 500 torr × 0.75

= 375 torr

so the total pressure of the liquid A and B = $P_A+P_B$

= 150 torr + 375 torr

= 525 torr