Calculate the molality of solution of nonvolatile solute if boiling point elevation is 1.75 K .

[ $\mathrm{K}_{\mathrm{b}}$ for solvent $=3 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$ ]

Calculate the relative lowering of vapour pressure of solution containing 3 g urea in 50 g water. [molar mass of urea $=60 \mathrm{~g} \mathrm{~mol}^{-1}$ ]

Which from following solutions exhibits minimum boiling point elevation under identical conditions? (Assume complete dissociation)

When 0.01 mole of nonvolatile solute is dissolved in certain solvent calculate the mass of solvent in kg if $\Delta \mathrm{T}_{\mathrm{b}}=0.6 \mathrm{~K}$ and $\mathrm{K}_{\mathrm{b}}$ for solvent= $2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$