A solution of an unknown non-dissociating solute was prepared by dissolving
0.300 g of the substance in 40.0 g of CCl4. The boiling point of the solution was
0.357 °C higher than that of the pure solvent. Calculate the molar mass of the
solute. Kb=5.02 °C/m
mass of solute = 0.300 g
mass of solvent = 40.0 g = 0.0400 kg
solute: unknown non-dissociating solute
molar mass of solute
Step 1: Calculate the molality of solution.
molality = 0.0711155 molal
Step 2: Calculate the number of moles of solute.
Note: 1 molal = 1 mol/kg
moles of solute = molality × mass of solvent
moles of solute = 0.0711155 mol/kg × 0.0400 kg
moles of solute = 0.00284462 mol
Step 3: Calculate the molar mass of solute.