delta T = Kb*molality.
Step 1. Calculate molality from the above.
Step 2. Remember that molality = # mols/kg solvent. Calculate # mols from that.
Step 3. Use # mols = g/molar mass to calculate molar mass.
Post your work if you get stuck.
The boiling point elevation of a solution consisting of 2.92 g of a nonvolatile solute in 82.4 g of benzene is 1.077 oC. What is the molecular weight of the unknown solute?
1 answer