Define the term ' osmotic pressure' . Descibe how the molecular mass of a substance can be determined on the basis of pressrure measurement.

Explanation

Osmotic pressure is the pressure of the soltuion column, that can prevent the entry of solvent molecules through a permeable membrane, when the solution and the solvent are separated by the same. It is shown by `pi`, It's unit is mm of Hg of atmosphere.
We knoe that
`piV=eta_(B)Rt`
`piV=(W_(B)RT)/(M_(B))" "( :. eta_(B)=(W_(B))/(M_(B)), "where" W_(B)rarr"mass of the solute" M_(B)rarr"molecular mass")`