Question

Calculate the osmotic pressure of 3 urea solution at 30 degree celsius

Answer 1

As osmotic pressure = i ∗ C ∗ R ∗T  

where I means van't - Hoff factor and it breaks even with 1 for non-electrolyte substance.  

in this way, I = 1  

C means grouping of substance.  

given, 3% urea arrangement.  

3% urea arrangement implies 3g urea is available in 100ml of arrangement.  

along these lines, number of mole of urea = 3g/60g = 1/20 [ mol wt of urea = 60 g/mol ]  

along these lines, molarity = number of mole × 1000/volume of arrangement  

= (1/20) × 1000/100 = 1/2 = 0.5  

R indicates all inclusive gas steady along these lines, R = 0.0821 atm.L/K/mol and T means temperature in Kelvin.  

here, T = 30°C = 273 + 30 = 303K  

along these lines, π = 1 × 0.5 × 0.0821 × 303 = 12.43815 atm