Question

The osmotic pressure of 5% (mass-volume)solution of cane sugar at 150$^\circ$C (mol. mass of sugar = 342) is

• A. 4 atm
• B. 5.07 atm
• C. 3.55 atm
• D. 2.45 atm

Answer 1

Answer: (B)

5.07 atm

Answer 2

$5 \%$ (mass-volume) solution means $5\, g$ of sugar dissolved in $100\, mL$ water. $\pi=\frac{n}{V} R T=\frac{5}{342} \times \frac{1000}{100} \times 0.0821 \times 423$ $=5.07 \,atm$