Molality Worksheet
Calculating molality requires specific units. The solvent is always in kilograms. You might need to convert amounts to
those units before solving the problem. You will need your periodic table.
1. What is the molality of a solution that contains 63.0 grams HNO3 in 0.500 kg H20?
2. What is the molality of a solution that contains .500 mol HC2H3O2 in 1.5 kg H2O?
3. What mass of water is required to dissolve 140.0 g NaCl to prepare a 1.50 m solution?
4. What mass of water must be used to dissolve .400 kg C2H5OH to prepare a 2.0 m solution?
5. What mass of H2SO4 must be dissolved in 2.2 kg H2O to produce a 1.30 m solution?
6. What is the molality of a solution that contains 80.0 g Al2(SO4)3 in 625.0 g of H2O?
7. What mass of HC2H3O2 must be dissolved in 800.0 g H2O to produce a 6.25 m solution?
8. What is the molality of a solution composed of 40.0 g of sodium nitrate (NaNO3) and 500 g of H2O?
9. A radiator is filled with a mixture of 3.0 kg ethylene glycol (C2H6O2) in 7.75 kg of water. Calculate the molality of
this solution.