Interactive Self-Study Module: Fugacities of Mixtures

This module uses screencasts and interactive simulations to explain the driving force for mass transfer in a mixture. Example problems are provided to allow the user to test themselves. We suggest reviewing the single-component fugacity module before using the learning resources in the following order: 

  1. Attempt to answer the multiple choice ConcepTests before watching the screencasts or working with the simulations.
  2. Watch the screencast that describe the phase diagrams and answer the questions within the screencasts.
  3. Use the two interactive simulations to further understand the driving force for phase equilibrium in mixtures.
  4. Try to solve the two example problems before watching the solution in the screencast.
  5. Answer the ConcepTests.


Fugacity is used to determine the direction of mass transfer between phases and to determine when phases are in equilibrium. 

This module is intended for a Thermodynamics course.

Before studying this module, you should:

  • Understand vapor-liquid equilbrium
  • Understand single-component fugacity

After studying this module, you should be able to:
  1. Determine which component has a higher fugacity.
  2. Determine the fugacity of each component.
  3. Draw a fugacity versus temperature graph for a binary mixture.