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Osmotic Pressure

A solution is...

Question

A solution is obtained by dissolving 0.2 moles of urea in a litre of water. Another solution is obtained by dissolving 0.4 moles of cane sugar. The lowering of vapour pressure of the first solution is

A

same as that of the second solution

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B

half of that of second solution

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C

double to that of second solution

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D

Cannot be predicted

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Solution

The correct option is B half of that of second solution
Lowering of vapour pressure depends on number of moles of solute, if the value of van't Hoff factor is same for both solutes.

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Similar questions

Q. A solution is obtained by dissolving

0.2

moles of urea in a litre of water. Another solution is obtained by dissolving

0.4

moles of cane-sugar in a litre of water at the same temperature. The lowering of vapour pressure to the first solution is:

(Assume total moles of both solution is same)

Q. A solution is obtained by dissolving 12g of urea (Mol.wt.=60) in a litre of solution. Another solution is prepared by dissolving 68.4g of cane sugar(Mol.wt.=342) in a litre of solution at the same temperature. The lowering of vapour pressure in the first solution is:

12 g

of urea is present in

1

litre of solution and

68.4 g

of sucrose is separately dissolved in

1

litre of another sample of solution. The lowering of vapour pressure of first solution is :

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

0.60 g

of urea in 360g 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}

)

Q. A solution obtained by mixing

100 m L

20 %

solution of urea (

m o l a r m a s s = 60

10 m L

1.65

solution of cane sugar (

m o l a r m a s s = 342

300 K

R = 0.083 L b a r K^{- 1} m o l^{- 1}

). Calculate.
(a)Osmotic pressure of urea solution, (b) Osmotic pressure of cane sugar solution, (c) Total osmotic pressure of solution:

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