A solution consisting of

1.2mol

of

A

and

2.3mol

of

B

exhibits ideal behaviour.\ (a) Explain in thermodynamic terms the reason why the vapour pressure of the solvent in a solution is lower than that of the pure solvent (Roult's law).\ (b) Calculate the partial vapour pressure of

A

in the mixture, given that the vapour pressure of pure

A

is 0.25 atm.\ (c) Calculate the vapour pressure of pure B, given that the total pressure over the mixture is

0.44atm

.

(a) Explain in thermodynamic terms the reason why the vapour pressure of the solvent in a solution is lower than that of the pure solvent (Roult's law). (b) Calculate the partial vapour pressure of A in the mixture, given that the vapour pressure of pure A is 0.25atm. (c) Calculate the vapour pressure of pure B, given that the total pressure over the mixture is 0.44atm