A 1.50 gram sample of urea is dissolved in 105.0 gram of water and produces a solution that boils at $100.12^{\circ}C$ . From these data , what is the molecular mass of urea?

Question

$\begin{array}{1 1} (a)\;60.8\;g\;mol \\ (b)\;70.8\;g\;mol \\ (c)\;90.8\;g\;mol \\ (d)\;80.8\;g\;mol \end{array} $