Calculate the molality of solution of nonvolatile solute if boiling point of solution, molal elevation constant for solvent are $319.8\ \text{K}$ and $2.5\ \text{K kg mol}^{-1}$ respectively [Boiling point of solvent = $319.5\ \text{K}$]

Identify correct statements from following regarding $0.2\ \text{M}$ urea and $0.2\ \text{M}$ sucrose solutions.

Calculate the molar mass of a nonvolatile solute if 6.4 g of it dissolved in 100 g water produces a relative lowering in vapour pressure of $0 \cdot 016$ at 300 K.

Calculate the cryoscopic constant of a solvent if depression in freezing point of $0 \cdot 3$ m solution of nonelectrolyte is $0 \cdot 48$ K