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Van't Hoff Factor

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Question

A solution containing 30 gms of non-volatile solute in exactly 90 gm water has a vapour pressure of 21.85 mm Hg at 25⁰C. Further 18 gms of water is then added to the solution. The resulting solution has a vapour pressure of 22.15 mm Hg at 25⁰C. Calculate the molecular weight of the solute.

A

74.2

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B

75.6

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C

67.83

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D

78.7

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Solution

The correct option is C
67.83

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Similar questions

A solution containing 30 gms of non-volatile solute in exactly 90 gm water has a vapour pressure of 21.85 mm Hg at 25⁰C. Further 18 gms of water is then added to the solution. The resulting solution has a vapour pressure of 22.15 mm Hg at 25⁰C. Calculate the molecular weight of the solute.

Q. A solution containing

30 g

of a non-volatile solute in exactly

90 g

water has a vapour pressure of

21.85 m m H g

25^{\circ} C

. Further 18 gm of water is then added to the solution. The resulting solution has a vapour pressure of 22.18 mmHg at

25^{\circ} C

. Calculate (a) molar mass of the solute, and (b) vapour pressure of water at

25^{\circ} C

.

Q. A solution containing

30 g

of a non-volatile solute in exactly

90 g

of water has a vapour pressure of

21.85 mm of Hg

25^{o} C .

18 g

of water is then added to the solution, the new vapour pressure becomes

22.15 mm of Hg

25^{o} C .

Calculate:
(i) Molar mass of the solute (in g/mol) and
(ii) Vapour pressure of water at

25^{o} C .

Q. A solution containing

30 g m

of non-volatile solute exactly in

90 g m

of water has a vapour pressure of

2.8 k P a

298 K

18 g m

of water is then added to the solution and the new vapour pressure becomes

2.9 k P a

298 K

Calculate: (i) molar mass of the solute (ii) vapour pressure of water at

298 K

Q. The vapour pressure of the solution containing 30 g. of non-volatile solute of molecular weight 60 in 360 gm of water approximately at

30^{0} c

is: ( vapour pressure of water at

30^{0} c

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Van't Hoff Factor

Standard XI Chemistry

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