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Raoult's Law

The osmotic p...

Question

The osmotic pressure of $\frac{M}{20}$ solution of urea at $27^{o} C$ is :

A

12.315

atm

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B

1.2315

atm

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C

0.12315

atm

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D

0.0123

atm

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Solution

The correct option is A $1.2315$ atm
The temperature is $27^{o} C$ which is equal to $300 K$ .
Molarity, $M = \frac{1}{20} M$
Now,

Osmotic pressure, $Π = M R T$ $= \frac{1}{20} \times 0.0821 \times 300$ $= 1.2315 a t m$

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