Worksheet: Molality

In this worksheet, we will practice calculating the molality of a solution and relating differences between molality and molarity to solvent density.

Q1:

Which of the following is the correct definition of the molarity of a solution?

  • AMoles of solute per cubic meter of solution
  • BGrams of solute per gram of solution
  • CMoles of solute per kilogram of solution
  • DGrams of solute per milliliter of solution
  • EMoles of solute per liter of solution

Q2:

What is the molality of 0.710 kg of sodium carbonate (washing soda), NaCO23, in 10.0 kg of water?

Q3:

A 13.0% solution of KCO23 by mass has a density of 1.09 g/cm3. What is the molality of the solution?

Q4:

Fill in the blanks: A 1 M solution consists of 1 mol of a solute in 1 L of , while a 1 m solution consists of 1 mol of a solute in 1 kg of .

  • Asolution, solution
  • Bsolution, solvent
  • Csolvent, solvent
  • Dsolvent, solution

Q5:

What is the molality of nitric acid in a concentrated solution of nitric acid (68.0% HNO3 by mass)?

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