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CUET · CHEMISTRY · PYQ PAPER 2025

The vapour pressure of pure water at \(25^{\circ} C\) is 23.75 mmHg.
The vapour pressure of the solution obtained by dissolving 34.2 g of sucrose \(\left( C _{12} H _{22} O _{11}\right)\) in 100 g of water will be :

  1. A 23.33 mmHg
  2. B 24.00 mmHg
  3. C 22.50 mmHg
  4. D 23.75 mmHg
Verified Solution

Answer & Solution

Correct Answer

(A) 23.33 mmHg

Step-by-step Solution

Detailed explanation

\(n_{C_{12}H_{22}O_{11}} = \frac{34.2 \text{ g}}{342 \text{ g/mol}} = 0.1 \text{ mol}\) \(n_{H_2O} = \frac{100 \text{ g}}{18 \text{ g/mol}} = 5.556 \text{ mol}\) \(X_{H_2O} = \frac{n_{H_2O}}{n_{H_2O} + n_{C_{12}H_{22}O_{11}}} = \frac{5.556}{5.556 + 0.1} = 0.9823\)…
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