A 1 molal $\mathrm{K}_4 \mathrm{Fe}(\mathrm{CN})_6$ solution has a degree of dissociation of 0.4 . Its boiling point is equal to that of another solution which contains 18.1 weight percent of a nbn electrolytic solute $A$. The molar mass of $A$ is $\_\_\_\_$ u. (Round off to the Nearest Integer). [Density of water $=1.0 \mathrm{~g} \mathrm{~cm}^{-3}$ ]