What is the relation between the vapour pressure of solution, vapour pressure of solvent and its mole…

What is the relation between the vapour pressure of solution, vapour pressure of solvent and its mole fraction in the solution?
  1. $\mathrm{P}_1=\mathrm{P}_1^{*} x_1$
  2. $\mathrm{P}_1^{*}=\mathrm{P}_1 x_1$
  3. $\mathrm{P}_1=\mathrm{P}_1^* x_2$
  4. $\mathrm{P}_1^{*}=\mathrm{P}_1 x_2$

Solution

The relation between the vapour pressure of the solution $\left(P_1\right)$, the vapour pressure of the pure solvent $\left(P_1^*\right)$, and the mole fraction of the solvent $\left(x_1\right)$ in the solution is given by Raoult's Law for an ideal solution.
Raoult's Law states: $P_1=P_1^* \cdot x_1$
Where: - $P_1$ is the vapour pressure of the solvent in the solution, - $P_1^*$ is the vapour pressure of the pure solvent, - $x_1$ is the mole fraction of the solvent in the solution. The correct relation is (1): $P_1=P_1^* \cdot x_1$

Asked in: MHT CET 2024 (04 May Shift 2)

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