Question

18 gms of glucose and 6 gms urea are dissolved in 1-litre aqueous solution at ${27}^{o}C$. The osmotic pressure of solution will be:

• A. 0.492 atm
• B. 0.245 atm
• C. 4.92 atm
• D. 0.049 atm

Answer 1

The correct option is C 4.92 atm

$M=\frac{n_1+n_2}{V}$

$=\frac{\frac{18}{180}+\frac{6}{60}}{1}$

$M=0\cdot 2M$

$\Pi =MRT$

$=0\cdot 2\times 0\cdot 0821\times 300$

$=4.92atm$

Hence, option C is correct.