Molality Practice Worksheet
A Grade 9 Chemistry worksheet focusing on understanding and calculating molality.
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Molality Practice Worksheet
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Date:
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Read each question carefully and answer to the best of your ability. Show all your work for calculation problems.
1. Molality is defined as the number of moles of per kilogram of .
2. The symbol for molality is .
3. Unlike molarity, molality does not change with .
4. Which of the following is the correct unit for molality?
mol/L
g/mol
mol/kg
kg/mol
5. What is the molar mass of NaCl (Sodium Chloride)? (Na = 22.99 g/mol, Cl = 35.45 g/mol)
35.45 g/mol
58.44 g/mol
22.99 g/mol
1.00 g/mol
6. Calculate the molality of a solution prepared by dissolving 2.5 moles of glucose (C₆H₁₂O₆) in 1.25 kg of water.
7. What is the molality of a solution containing 15 g of NaCl dissolved in 500 g of water? (Molar mass of NaCl = 58.44 g/mol)
8. Molality is a measure of the concentration of a solute in a solution.
True
False
9. To calculate molality, you need the volume of the solvent.
True
False
10. Explain why molality is often preferred over molarity for experiments involving temperature changes.
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