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Standard XII

Chemistry

Molality

15 The molar ...

Question

15 The molar volume of liquid benzene (density =0.877 g/ml) increases by a factor of 2750 as it vaporises at 20 degree C and that of liquid toluene (density 0.867 g/ml) increases by a factor of 7720 at 20 degree C.A solution of benzene and toluene at 20 degree C has a vapour pressure of 46 torr.Find the mole fraction of benzene in the vapour above the solution.

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Q. 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

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.

Q. The molar volume of liquid benzene (density

= 0.877 g m L^{- 1}

) increase by a factor of

2750

as it vaporizes at

20^{\circ} C

and that of liquid toluene (density

= 0.867 g m L^{- 1}

) increases by a factor of

7720

20^{\circ} C

solution has vapour pressure of

46.0 t o r r

. Find the mole fraction of benzene in the vapour above the solution.

(write the value to the nearest integer)

A solution has 2:3 molar ratio of toluene to benzene. The vapour pressure of benzene and toluene at 25 degree Celsius are 95 and 28 bar respectively. The mole fraction of toulene vapour is?

Q. The molar volume of liquid benzene (density

= 0.877 g m L^{- 1}

) increases by a factor of

2750

as it vaporises at

20^{\circ} C

while in equilibrium with liquid benzene. At

27^{\circ} C

when a non-volatile solute (that does not dissociate) is dissolved in

54.6 c m^{3}

of the benzene vapour pressure of this solution, is found to be

98.88 m m H g

Calculate the freezing point of the solution.
Given: Enthalpy of vaporisation of benzene

(l) = 394.57 J / g

Molal depression constant for benzene

= 5.12 K k g . m o l^{- 1}

Freezing point of benzene

= 278.5 K

Q. Benzene and toluene form nearly ideal solution At

20^{\circ} C,

the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at

20^{\circ} C

for a solution containing 78 g of benzene and 46 g of toluene in torr is

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