Question

A solution has an osmotic pressure of 0.0821 atm. at 300 K. Its concentration would be: 

(a) 0.66 M 

(b) 0.32 M 

(c) 0.066 M 

(d) 0.033M

Answer 1

Correct Answer is: (d) 0.033M

Osmotic Pressure (Π) is given by:

Π= CRT

(Where C is concentration, R is gas constant, T is temperature)

Given, Π = 0.0821 atm

T = 300K

Then using above equation,

C = 0.0821÷ (0.0821×300) mole per Litre

C= 0.003333333 moles per litre