The molar volume of liquid benzene (density =0.877 g/mL) increases by a factor of 2750 as it vapourises at 20∘C and that of liquid toluene (density =0.867 g/mL) increases by a factor of 7720 at 20∘C. A solution of benzene and toluene at 20∘C has a vapour pressure of 46.0 torr. Find the mole fraction of benzene in the vapour above the solution.

The molar volume of liquid benzene (density =0.877 g/mL) increases by

1.	The molar volume of liquid benzene (density =0.877 g/mL) increases by a factor of 2750 as it vapourises at 20∘C and that of liquid toluene (density =0.867 g/mL) increases by a factor of 7720 at 20∘C. A solution of benzene and toluene at 20∘C has a vapour pressure of 46.0 torr. Find the mole fraction of benzene in the vapour above the solution.
Answer» The molar volume of liquid benzene (density $= 0.877 g / m L$ ) increases by a factor of $2750$ as it vapourises at $20^{\circ} C$ and that of liquid toluene (density $= 0.867 g / m L$ ) increases by a factor of $7720$ at $20^{\circ} C$ . A solution of benzene and toluene at $20^{\circ} C$ has a vapour pressure of $46.0 t o r r$ . Find the mole fraction of benzene in the vapour above the solution.