Solutions Question 279

Question: If 20 g of a solute was dissolved in 500 ml of water and osmotic pressure of the solution was found to be 600 mm of Hg at $ 15^{o}C, $ then molecular weight of the solute is [BHU 2004]

Options:

A) 1000

B) 1200

C) 1400

D) 1800

Show Answer

Answer:

Correct Answer: B

Solution:

$ \pi =\frac{n}{V}RT=\frac{m/MRT}{V} $

$ \frac{600}{760}=\frac{20\times 0.0821\times 288\times 1000}{500\times M} $ ; $ M=1200 $



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