${\text{50 }}\, \times {\text{ 36 = }}{{\text{N}}_{\text{2}}}\,\, \times {\text{ 100}}$
$ \Rightarrow {\text{ }}{{\text{N}}_{\text{2}}}{\text{ = 18}}$
$\because \,\,{\text{M}}\,\, \times \,\,{\text{n}}\,\, = \,\,{\text{N}}\,\, \Rightarrow \,\,{\text{M}}\,\, = \,\,\frac{{\text{N}}}{{\text{n}}}\,\, = \,\,\frac{{18}}{2}\,\, = \,\,9$
(આપેલઃ ઈથેનોલનું ઠારણ બિંદુ $156.0\, K$, ઈથેનોલની ધનતા $0.80\, g\, cm ^{-3}$, ઈથેનોલનો ઠારબિંદુ અવનયન અચળાંક $2.00\, K\, kg \,mol ^{-1}$ )