# How would you determine the molar mass from osmotic pressure.

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How would you determine the molar mass from osmotic pressure.

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According to van’t Hoff equation

π = CRT

C = n / V

Here n = number of moles of solute dissolved in ‘V’ litre of the solution.

π = $\frac{n}{V}$.RT = πV = nRT

If the solution is prepared by dissolving WB of the non-volatile solute in WA g of solvent, then the number of moles of ‘n’ is

$n=\frac{W_B}{M_B}$

where

MB = molar mass of the solute

Substituting n value, we get

From the above equation, we can calculate the molar mass of the solute.