Molality: Definition & Formula


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question 1 of 3

What is the molality of a solution containing 100 grams of glucose (C6H12O6, molar mass = 180 g/mol) dissolved in 2.5 kg of water?

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1. What is the molality of 0.4 moles of KCl in 1500 g of solvent?

2. A solution has a molality of 1.58 m, where the moles of the solute is 0.3 moles. What is the mass of the solvent in kg?

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About This Quiz & Worksheet

Molality is an important concept to know in chemistry, and this quiz/worksheet will help you test your understanding of its calculation.

Quiz & Worksheet Goals

In these assessments you'll be tested on the following:

  • Correct unit for molality
  • Molality of a solution containing HCI
  • Mass of a solvent

Skills Practiced

This quiz and worksheet allow students to test the following skills:

  • Problem solving - use acquired knowledge to answer practice problems involving the calculation of molality
  • Information recall - access the knowledge you've gained regarding molality units
  • Making connections - use understanding of molality calculation in a variety of chemical contexts

Additional Learning

To learn more about molality, review the accompanying lesson Molality: Definition & Formula. This lesson covers the following objectives:

  • Define molality
  • Know the unit in which molality is expressed
  • Identify the formulas necessary for the calculation of molality
  • Understand how to calculate molality through provided examples