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The vapour pressure of a solvent is decreased by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in the vapour pressure is to be 20 mm of mercury?

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Important Questions on Solutions

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Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

The vapour pressure of a solution of glucose is

720 mmHg

100^{o} C

. What is the mole fraction of water in this solution?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

The vapour pressure of acetone at

20^{o} C

185 torr

. When

1.2 g

of a non-volatile substance was dissolved in

100 g

of acetone at

20^{o} C

, its vapour pressure was

183 torr

. The molar mass

(g m o l^{- 1})

of the substance is:

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

8 g

of a non-electrolyte solute is dissolved in

114 g

n -

octane to reduce its vapour pressure to

80 %,

the molar mass (in

g {mol}^{- 1}

) of the solute is [Given that molar mass of n-octane is

114 g {mol}^{- 1}

]

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

vapour pressure of water at

293 K

17535 mm Hg .

The vapour pressure of water at

293 K

containing

25 g

of glucose dissolved in

450 g

of water is

HARD

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

100^{o} C

the vapour pressure of a solution of 6.5 g of a non-volatile solute in 100 g water is 732 mm. If

K_{b} = 0.52

, the boiling point of this solution will be:

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

Benzene and toluene form nearly ideal solution. At

20 ° C

, the vapour pressure of benzene is

75 torr

and that of toluene is

22 torr

. The partial vapour pressure of benzene at

20 ° C

for a solution containing

78 g

of benzene and

46 g

of toluene (in

torr

) is

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

A set of solutions is prepared using

180 g

of water as a solvent and

10 g

of different non-volatile solutes

A, B

and

C

. The relative lowering of vapour pressure in the presence of these solutes are in the order [Given, molar mass of

A = 100 g {mol}^{- 1}; B = 200 g {mol}^{- 1}; C = 10, 000 g {mol}^{- 1}

]

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

In which of the following lowering of vapour pressure would be maximum?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

At room temperature, a dilute solution of urea is prepared by dissolving

0.60 g

of urea in

360 g

of water. If the vapour pressure of pure water at this temperature is

35 m m H g

, lowering of vapour pressure will be:
(molar mass of urea

= 60 g m o l^{- 1}

)

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

Two open beakers one containing a solvent and the other containing a mixture of that solvent with a non volatile solute are together sealed in a container. Over time:

HARD

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

224 mL

{SO}_{2 (g)}

298 K

and

1 atm

is passed through

100 mL

0.1 M NaOH

solution. The non-volatile solute produced is dissolved in

36 g

of water. The lowering of vapour pressure of solution (assuming the solution is dilute) (

P °_{(H_{2} O)} = 24 mm

Hg

) is

x \times 10^{- 2} mm

Hg

the value of

x

is (Integer answer)

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

In 108 g of water, 18 g of a non-volatile compound is dissolved. At

100^{o} C

the vapor pressure of the solution is 750 mm Hg. Assuming that the compound does not undergo association or dissociation, the molar mass of the compound in

g m o l^{- 1}

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

The vapor pressure of a dilute solution of glucose is

750 mm

of mercury at

373 K .

The mole fraction of the solute is _________

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

Which of the following statement is true?

HARD

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

104.2 ° C,

the vapour pressure of a solution of

7.5 g

of a solute in

100 g

of water is

740 mm

Hg

and

K_{b} = 0.55,

then the boiling point of the solution is ________

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

Vapour pressure of water at

293 K

17.535 mm Hg

. Calculate the vapour pressure of water at

293 K

when

25 g

of glucose is dissolved in

450 g

of water.

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

The solution having lowest vapour pressure amongst the following is

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

Relative lowering of vapour pressure of a dilute solution of glucose dissolved in

1 kg

of water is

0.002

. The molality of the solution is

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

18 g

glucose

(C_{6} H_{12} O_{6})

is added to

178.2 g

water. The vapour pressure of water (in torr) for this aqueous solution is:

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

The mass of a non-volatile, non-electrolyte solute (molar mass

= 50 g {mol}^{- 1}

) needed to be dissolved in

114 g

octane to reduce its vapour pressure by

75 %

, is:

The vapour pressure of a solvent is decreased by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in the vapour pressure is to be 20 mm of mercury?

Important Questions on Solutions

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