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Question

Chemistry Question on Solutions

The vapour pressure of water is 12.3 kPa at 300 K. The V.P. of 1 M solution of a non-volatilenon electrolyte solution is

A

10.08 kPa

B

12.08 kPa

C

8.3 kPa

D

10.3 kPa

Answer

12.08 kPa

Explanation

Solution

As the solution is quite dilute 1 M = 1 m. Thus, 1 mol of solute is present in 1000 g (55.5 mol) of water 11+55.5≈12.3−pA12.3\frac{1}{1+55.5} \approx \frac{12.3 - p_A}{12.3} pA=12.08p_A = 12.08 k Pa.