Write the raoults law for solutions of non - volatile solute how will you calculate elevation ?
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Raoult's law states that the vapor pressure of a solvent above a solution is equal to the vapor pressure of the pure solvent at the same temperature scaled by the mole fraction of the solvent present.
P
solution
=χ
solvent
P
solvent
o
The molar mass of a non-volatile solute be determined by using following equation.
P
0
P
0
−P
=
W
1
M
2
W
2
M
1
P
0
= vapour pressure of pure solvent
P= vapour pressure of solution
W
2
= Mass of solute.
M
2
= Molar mass of solute.
W
1
= Mass of solvent.
M
1
= Molar mass of solvent
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