A solution containing,8g of a substance in 100g of diethyl ether boils at $36.86^{\large\circ}C$,whereas pure ether boils at $35.60^{\large\circ}C$.Determine the molecular mass of the solute.(For ether $K_b=2.02kg mol^{-1})$

Question

$\begin{array}{1 1}128.25gmol^{-1}\\138.25gmol^{-1}\\148.25gmol^{-1}\\168.25gmol^{-1}\end{array} $