Liquid Solution

The solution containing \(6 \mathrm{~g}\) urea (molar mass 60 ) per \(\mathrm{dm}^3\) of water and another solution containing \(9 \mathrm{~g}\) of solute \(\mathrm{A}\) per \(\mathrm{dm}^3\) water freezes at same temperature. What is molar mass of \(\mathrm{A}\) ?