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?

  • AGrams of solute per milliliter of solution
  • BMoles of solute per cubic meter of solution
  • CMoles of solute per kilogram of solution
  • DMoles of solute per liter of solution
  • EGrams of solute per gram of solution

Q2:

What is the molality of 0.710 kg of sodium carbonate (washing soda), N a C O 2 3 , in 10.0 kg of water?

Q3:

A 13.0% solution of K C O 2 3 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 .

  • ASolvent, solvent
  • BSolvent, solution
  • CSolution, solution
  • DSolution, solvent

Q5:

What is the molality of nitric acid in a concentrated solution of nitric acid (68.0% H N O 3 by mass)?

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