Vapour pressure of solution and of pure solvent are $\mathrm{P}_1$ and $\mathrm{P}_1{ }^0$ respectively. If…

Vapour pressure of solution and of pure solvent are $\mathrm{P}_1$ and $\mathrm{P}_1{ }^0$ respectively. If $\frac{P_1}{P_1^0}$ is 0.15 , find the mole fraction of solute.
  1. 0.66
  2. 0.85
  3. 0.15
  4. 0.33

Solution

$\begin{aligned} & \frac{\mathrm{P}_1^0-\mathrm{P}_1}{\mathrm{P}_1^0}=\text { mole fraction of solute } \\ & 1-\frac{\mathrm{P}_1}{\mathrm{P}_1^0}=\mathrm{x}_{\text {solute }} \\ & \mathrm{x}_{\text {solute }}=1-0.15=0.85\end{aligned}$

Asked in: MHT CET 2021 (24 Sep Shift 2)

Practice more Solutions questions on Aicharya