Why determination of osmotic pressure is preffered for finding molecular mass of macro-molecules?

Which colligative property is preferred for the molecular mass determination of macromolecules?

van't Hoff proved that osmotic pressure ( pi ) is a colligative property. For an ideal solution, osmotic pressure( pi ) is helpful to determine that molecular mass of solute using M_(B)=(W_(B)RT)/(pi.V) Relation can exxpressed by the curve (C = concentration) :

Camphor is often used in molecular mass determination because

How can we find accurably molecular mass of a polymer ?

6xx10^(22) gas molecules each of mass 10^(-24)kg are taken in a vessel of 10 litre. What is the pressure exerted by gas molecules ? The root mean square speed of gas molecules is 100 m//s .

Why solubility of alcohols in water decreases with increase in molecular mass ?

Why is camphor preferred as a sovent for measuring the molecular mass of napthalene by Rast method?

A vessel contains two non-reactive gases, neon (monatomic) and oxygen (diatomic). The ratio of their partial pressures is 3.2. Estimate the ration of (i) number of molecules and (ii) mass density of neon and oxyge in the vessel. Atomic mass of Ne- 20.2 u, molecular mass of O_2 = 32.0 u.

3.0 g of non-volatile solute when dissolve in 1 litre water, shows an osmotic pressure of 2 atmosphere at 300 K. Calculate the molar mass of the solute. (R = 0.0821 litre atm K^(-1)"mol"^(-1) ).