what is relative lowering of vapour pressure how can lowering of vapour pressure be measured using static method
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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
and M
2
are the molar masses of solvent and solute respectively.
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