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Standard XII

Chemistry

Van't Hoff Factor

A solution co...

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.

74.2

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75.6

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67.83

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78.7

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Solution

The correct option is C
67.83

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Similar questions

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

water has a vapour pressure of

21.85 m m

H g

25^{o} C

. Further

18 g

of water is then added to the solution.The resulting solution has a vapour pressure of

22.15 m m

H g

25^{o} C

. Calculate the molecular weight of the solute.

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

. Further,

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. 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 .

Further,

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 .

QUESTION 2.19

A solution containing 30 g of non-volatile solute exactly in 90 g of water has a vapour pressure of 2.8 kPa at 298 K. Further, 18 g of water is then added to the solution and the new vapour pressure becomes 2.9 k Pa at 298 K. Calculate (i) molar mass of the solute (ii) vapour pressure of water at 298 K.

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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.

The correct option is C 67.83

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.

The correct option is C
67.83