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Standard XII

Chemistry

Abnormal Colligative Properties

The vapour pr...

Question

The vapour pressure of a solution having 2.0 g of solute X (gram atomic mass=32 g/mol) in 100 g of CS2 (vapour pressure =854torr) is 848.9 torr.The molecular formula of solute 1) X 2)X2 3)X4 4)X8

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Q. At

48^{o} C

, the vapour pressure of pure

C S_{2}

850 torr

. A solution of

2.0 g

of sulphur in

100 g

C S_{2}

has a vapour pressure

844.9 torr

. Determine the atomicity of sulphur molecule.

Q. 100 g of liquid

A

(molar mass 140 g

m o l^{- 1}

) was dissolved in 1000 g of liquid

B

(molar mass 180 g

m o l^{- 1}

) The vapour pressure of pure liquid

B

was found to be 500 torr.

Calculate the vapour pressure of pure liquid

A

and its vapour pressure in the solution if the total vapour pressure of the solution is 475 torr:

100 g

of liquid A (molar mass

140 g m o l^{- 1})

was dissolved in

1000 g

of liquid B (molar mass

180 g m o l^{- 1})

. The vapour pressure of pure liquid B was found to be

500 t o r r

. Calculate the vapour pressure of pure liquid A and its vapour pressure in the solution if the total vapour pressure of the solution is

475 t o r r

Q. 5.8 g of a non-volatile solute was dissolved in 100g of carbon disulphide

(C S_{2})

. The vapour pressure of the solution of the solution was found to be 190 mm of Hg. Calculate molar mass of solute given the vapour pressure of

(C S_{2})

is 195 mm of Hg.
[molar mass of

(C S_{2})

= 76 g mol

^{- 1}

]

QUESTION 2.36

100 g of liquid A (molar mass $140 g m o l^{- 1}$ ) was dissolved in 1000 g of liquid B (molar mass $180 g m o l^{- 1}$ ). The vapour pressure of pure liquid B was found to be 500 torr. Calculate the vapour pressure of pure A and its vapour pressure in the solution if the total vapour pressure of the solution is 475 torr.

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