Molality Practice Worksheet
A Grade 11 Chemistry worksheet focusing on calculating molality, understanding its applications, and differentiating it from molarity.
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Molality Practice Worksheet
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Read each question carefully and show all your work. Use the provided space for calculations and answers. Remember to include appropriate units in your final answers.
1. Molality (m) is defined as the number of moles of per kilogram of .
2. Unlike molarity, molality is independent of because it is based on mass, not volume.
3. The unit for molality is or .
4. Calculate the molality of a solution prepared by dissolving 25.0 g of NaCl (Molar mass = 58.44 g/mol) in 500.0 g of water.
5. A solution contains 15.0 g of sucrose (C₁₂H₂₂O₁₁, Molar mass = 342.3 g/mol) dissolved in 200.0 mL of ethanol. If the density of ethanol is 0.789 g/mL, what is the molality of the solution?
6. Which of the following statements is TRUE regarding molality and molarity?
Molarity changes with temperature, but molality does not.
Both molarity and molality are dependent on the volume of the solution.
Molality is moles of solute per liter of solution.
Molarity is used for colligative properties, while molality is not.
7. Explain why molality is often preferred over molarity in studies involving colligative properties.
8. Adding more solvent to a solution will decrease its molality.
True
False
Imagine you are preparing a solution in the beaker shown. If you add 10.0 g of glucose (C₆H₁₂O₆, Molar mass = 180.16 g/mol) to 125 g of water. What is the molality of this glucose solution?