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Raoult's Law

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Question

What happens to vapour pressure of water if a tablespoon of sugar is added to it?

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Solution

The vapour pressure of water is lowered if a tablespoon of sugar is added to it. When a non volatile solute is added to a solvent, the vapour pressure of the resulting solution is less than the vapour pressure of pure solvent.

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What happens when sugar is added to water?

Q. Vapour pressure of water is 360 mm Hg, how much urea should be added to 200 ml. water to reduce its vapour pressure by 0.5%? (Molecular weight of urea=60)

Q. Vapour pressure of water is

360

mm Hg, how much urea should be added to

200

mL water to reduce its vapour pressure by

0.5 %

? (Molecular wt. of urea

= 60

)

A_{X} B_{Y}

when added to 1.08 kg of water, lowers its vapour pressure by 35 torr to 700 torr. If further 1184 g of methanol is added, then the vapour pressure increase by 37 torr. Consider only few vapors are formed, and

A_{X} B_{Y}

is a non volatile solute. What is the value of a if the vapour pressure of pure methanol is

a \times 10^{2}

Consider a beaker with some quantity of water, as sugar is added to it the pressure at a certain depth ___.

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