Question

Which of the following analogies is correct regarding Raoult’s law:
$\text{Depression in freezing point}:\text{molality}::\text{Raoult’s law}:---$

• A. Molality
• B. Molarity
• C. Mole Fraction
• D. Percentage composition $\left(\frac{w}{v}\right)$

Answer 1

The correct option is C Mole Fraction

Raoult's law states that a solvent's partial vapour pressure in a solution (or mixture) is equal or identical to the vapour pressure of the pure solvent multiplied by its mole fraction in the solution.

Mathematically, Raoult's law equation is written as;
$P_{\text{solution}}=X_{\text{solvent}}{P}_{\text{solvent}}^0$
Where,
$P_{\text{solution}}=$ vapour pressure of the solution
$X_{\text{solvent}}=$ mole fraction of the solvent
$P_{\text{solvent}}^0=$ vapour pressure of the pure solvent