Molality Calculations Worksheet
A Grade 12 Chemistry worksheet focused on understanding and calculating molality, including problem-solving exercises.
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Molality Calculations Worksheet
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Read each question carefully and provide your answers in the space provided. Show all your work for calculations.
1. Molality is defined as the number of moles of solute per kilogram of .
2. The symbol for molality is .
3. Unlike molarity, molality does not change with .
1. Which of the following units is used for molality?
moles/L
moles/kg
g/mol
kg/L
2. Why is molality preferred over molarity for some applications?
It is easier to calculate.
It depends on the volume of solution.
It is independent of temperature changes.
It uses the total mass of the solution.
1. Calculate the molality of a solution prepared by dissolving 2.5 g of NaCl (molar mass = 58.44 g/mol) in 200 g of water.
2. A solution of glucose (C₆H₁₂O₆, molar mass = 180.16 g/mol) is prepared by dissolving 15.0 g of glucose in 150.0 g of water. What is the molality of the solution?
3. If a 0.50 m solution contains 0.10 moles of solute, what is the mass of the solvent in kilograms?
1. Molality is a colligative property.
True
False
2. Increasing the temperature of a solution will always decrease its molality.
True
False
Explain the difference between molality and molarity, and discuss when it is more appropriate to use each unit of concentration.