A solution is prepared by dissolving of non-volatile solute in of water. It has an osmotic pressure…

A solution is prepared by dissolving $9\cdot25\text{ g}$ of non-volatile solute in $450\text{ ml}$ of water. It has an osmotic pressure of $350\text{ mm of Hg}$ at $27^\circ\text{C}$. Assuming the solute is non-electrolyte, determine its molecular mass. ($R = 0\cdot0821\text{ lit atm K}^{-1}\text{mol}^{-1}$)