What is vapour pressure of a solution containing $1.8 g$ glucose in 16. $2 \mathrm{~g}$ of water if vapour…

What is vapour pressure of a solution containing $1.8 g$ glucose in 16. $2 \mathrm{~g}$ of water if vapour pressure of water is $32 \mathrm{~mm} \mathrm{Hg}$ ?
  1. 22. $2 \mathrm{~mm} \mathrm{Hg}$
  2. 26. $6 \mathrm{~mm} \mathrm{Hg}$
  3. 24. $6 \mathrm{~mm} \mathrm{Hg}$
  4. 31. $7 \mathrm{~mm} \mathrm{Hg}$

Solution

$\begin{aligned} & \frac{P_A^{\circ}-P_A}{P_A^{\circ}}=x_B \simeq \frac{n_B}{n_A} \\ & \frac{32-P_A}{32}=\frac{1.8}{180} \times \frac{18}{16.2} \\ & =0.0111 \\ & P_A=32-0.3555 \\ & =31.7 \mathrm{~mm} \\ & \end{aligned}$

Asked in: MHT CET 2022 (08 Aug Shift 1)

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