Mole fraction of toluene in the vapour which is in equilibrium with a solution containing benzene and toluene having 2 moles each is Given: Saturation vapour pressure of benzene = 120 torr Saturation vapour pressure of toluene = 80 torr

Question

Mole fraction of toluene in the vapour which is in equilibrium with a solution containing benzene and toluene having 2 moles each is Given: Saturation vapour pressure of benzene = 120 torr Saturation vapour pressure of toluene = 80 torr (A) 0.5 (B) 0.25 (C) 0.6 (D) 0.4

Tardigrade Admin · Accepted Answer

Total vapour pressure =(1/2)×120+(1/2)× 80=100 torr yA× 100 = xA P°A as per Raoultâs law or yt=(1/2)× (80/100)=0.4

Q. Mole fraction of toluene in the vapour which is in equilibrium with a solution containing benzene and toluene having $2$ moles each is Given: Saturation vapour pressure of benzene = $120 t orr$ Saturation vapour pressure of toluene = $80 t orr$

$0.5$

$0.25$

$0.6$

$0.4$

Total vapour pressure
$= \frac{1}{2} \times 120 + \frac{1}{2} \times 80 = 100$ torr
$y_{A} \times 100 = x_{A} P_{A}^{\circ}$ as per Raoult’s law
or $y_{t} = \frac{1}{2} \times \frac{80}{100} = 0.4$

Q. Mole fraction of toluene in the vapour which is in equilibrium with a solution containing benzene and toluene having 2 moles each is Given: Saturation vapour pressure of benzene = 120torr Saturation vapour pressure of toluene = 80torr

0.5

0.25

0.6

0.4