What is Raoult's law? How can molar mass of a non-volatile solute be determined with its help?

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Solution

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.
$P_{s o l u t i o n} = χ_{s o l v e n t} P_{s o l v e n t}^{o}$
The molar mass of a non-volatile solute be determined by using following equation.
$\frac{P^{0} - P}{P^{0}} = \frac{W_{2} M_{1}}{W_{1} M_{2}}$
$P^{0} =$ 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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