A solution contains 10g of a solute and 116g of acetone at $30^{\large\circ}$C.Its vapour pressure is 290 Torr.If the vapour pressure of pure acetone is 300 Torr at $30^{\large\circ}$C,the molar mass of solute is

Question

$\begin{array}{1 1}75gmol^{-1}\\100gmol^{-1}\\125gmol^{-1}\\150gmol^{-1}\end{array}$