What is osmotic pressure and how is it related to the molecular mass of the non-volatile substance?

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On dissolving 0.25 g of a non-volatile substance in 30 mL of benzene (density 0.8 g "mol"^(-1) ) its freezing point decreases by 0.40^(@)C . Calculate the molecular mass of the non-volatile substance. ( K_(f) for benzene is 5.12 k m^(-1) )

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How is DeltaT_f and DeltaT_b related to molecular mass of a solute?

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) :

The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A non-volatile, non-electrolyete solid weighing 0.5g when added to 39.0 g of benzene (molar mass 78 g mol^(-1) . Vapour pressure of the solution, then, is 0.845 bar. What is the molar mass of the solid substance?

What is the average molecular mass of drugs ?