Question

1 mole of liquid A and 2moles of liquid B make a solution having a total vapour pressure of 38 the vapour pressure of A and B are 45 torr and 36 torr respectively the described solution is
a is an ideal solution
b shows negative deviation
c is a minimum boiling azeotrope
d has volume greater than the sum of individual volumes​

Answer 1

I hope it is helpful for u

Answer 2

Answer: b) shows negative deviation

Explanation:

$P_{t}=(X_{A}\times P^{0}A)+(X_{B}\times P^{0}B)\\X_{A}=1/3;X_{B}=2/3\\P^{0}A=45\ torr;P^{0}B=36\ torr\\P_{t}(experimental)=38 torr\\P_{t}(theoretical)=(1/3\times 45)+(2/3\times 36)=15+24=39$

• The total pressure obtained theoretically is 39 torr while the experimental total pressure obtained is 38 torr which means the described solution shows a negative deviation.

• If Experimental data exceeds theoretical there is a positive deviation.

• If the experimental value is equal to the theoretical value it is an ideal solution.