Question

What is relative lowering of vapor pressure?

Answer 1

Answer:

relative lowering of vapour pressureis the ratio of vapour pressure of pure solvent to that of solution

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Answer 2

Answer:

The relative lowering of vapour pressure is the ratio of vapour pressure lowering of solvent from solution to the vapour pressure of pure solvent.

The relative lowering of vapour pressure =

p

1

0

Δp

=

p

1

0

p

1

0

−p

Here, p

1

0

is the vapour pressure of pure solvent and Δp is the vapour pressure lowering of solution.

To determine the molar-mass of a solute, the following expression is used

p

1

0

Δp

=

W

1

M

2

W

2

M

1

W 1 and W 2

are the masses of solvent and solute respectively.

M 1 & M2

are the molar masses of solvent and solute respectively.