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 $
