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 non electrolytic solute $\mathrm{A}$. The molar mass of $\mathrm{A}$ is _____ u. (Round off to the Nearest Integer). [Density of water $\left.=1.0 \mathrm{g}{ \mathrm{cm}}^{-3}\right]$

Consider the above reaction. The percentage yield of amide product is (Round off to the Nearest Integer). (Given : Atomic mass : $\mathrm{C}:12.0\mathrm{u},\mathrm{H}:1.0\mathrm{u}$ $\mathrm{N}:14.0\mathrm{u},\mathrm{O}:16.0\mathrm{u},\mathrm{Cl}:35.5\mathrm{u})$

In the above reaction, $3.9 \mathrm{g}$ of benzene on nitration gives $4.92 \mathrm{g}$ of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is _________ $\%$. (Round off to the Nearest Integer).

(Given atomic mass : $\mathrm{C} :12.0 \mathrm{u}, \mathrm{H} :1.0 \mathrm{u}$$\mathrm{O} :16.0 \mathrm{u},\mathrm{N} :14.0 \mathrm{u}$)