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Raoult's Law

12 g of urea ...

Question

12 g of urea is dissolved in 1 litre of water and 68.4 g of sucrose is dissolved in 1 litre of water.The lowering of vapour pressure of the first case is:

Equal to second

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Greater than second

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Less than Second

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Double that of second.

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Solution

The correct option is A
Equal to second

12g of urea =mol = 0.2 mole

68.4 g of sucrose == 0.2 mole

As molefraction of both the solutes are same, the lowering of Vapour pressures will be equal.

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12 g of urea is dissolved in 1 litre of water and 68.4 g of sucrose is dissolved in 1 litre of water.The lowering of vapour pressure of the first case is:

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12 g of urea is dissolved in 1 litre of water and 68.4 g of sucrose is dissolved in 1 litre of water.The lowering of vapour pressure of the first case is:

The correct option is A Equal to second12g of urea =mol = 0.2 mole 68.4 g of sucrose == 0.2 mole As molefraction of both the solutes are same, the lowering of Vapour pressures will be equal.

The correct option is A
Equal to second

12g of urea =mol = 0.2 mole

68.4 g of sucrose == 0.2 mole

As molefraction of both the solutes are same, the lowering of Vapour pressures will be equal.