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. Your retention of material in this module will increase if you write down reasons for your answers to ConcepTests, questions in screencasts, and questions to answer before using interactive simulations, and you try to solve the example problems before watching the screencast solutions. We suggest reviewing the single-component fugacity module before using the learning resources in the following order:

1. Attempt to answer the multiple choice ConcepTest and solve the example problem before watching the screencasts or working with the simulations.
2. Watch the screencasts that describe fugacities in mixtures and answer the questions within the screencasts.
3. Review important equations for fugacities of mixtures.
4. Use the interactive simulations to further understand the driving force for phase equilibrium in mixtures.
5. Try to solve the example problems before watching the solutions in the screencasts.
6. Answer the ConcepTests.
7. Look at the list of key points, but only after you try to list the key points yourself.