(આપેલ \(m = 40\), \(W = 114\, g\) , \({M_{octane }} = 114 \))
\( = \,\,\frac{{100\,\, - \,\,80}}{{80}}\,\, = \,\,\frac{{w\,\, \times \,\,114}}{{40\,\, \times \,\,114}}\,\,\,\,\therefore \,\,w\,\, = \,\,10\,\,h\)
(આપેલ : $R =0.083\,L\,bar\,K ^{-1}\,mol ^{-1}$ )