Question

The osmotic pressure of a sugar solution at ${24}^{o}C$ is 2.5 atm.The concentration of the solution in mole per litre is:

• A. 10.25
• B. 1.025
• C. 102.5
• D. 0.1025

Answer 1

The correct option is D 0.1025

Given,

$\pi =$ osmatic pressure=-2.5 atm

$T=25{}^{0}C=297K$

$R=$ Gas constant $=0.0821L.atm{K}^{-1}mo{l}^{-1}$

$\pi =CRT$

$\Rightarrow 2.5=C\times 0.0821\times 297$

$\therefore C=0.1025mol{L}^{-1}$

Hence, the correct option is $D$