Solution of 12g of non-electrolyte (A) prepared by dissolving it in...

The pressure which applied externally in the solution side to prevent the osmosis process is known as osmotic pressure. It can be denoted by $\pi$.

Since, $( {\pi}_{1}{)}_{nonelectrolyte} = ( {\pi}_{2}{)}_{glucose}$
${C}_{1}RT = {C}_{2}RT$
$\dfrac{{W}_{1}}{{M}_{1}} = \dfrac{{W}_{2}}{{M}_{2}}$

Empirical mass of
$\dfrac{12}{{M}_{1}} = 0 . 05$
${M}_{1} = \dfrac{12}{0 . 05} = 240$