These simulations were prepared using Mathematica. Download the free CDF player, and then download the simulation CDF file (click on the title or the figure to download below). Try to predict the behavior when a parameter changes before using a slider to change that parameter. Screencasts are provided that explain how to use these simulations.

Simulation: Fugacities in an Ideal Binary Mixture

This Demonstration shows how the fugacities of benzene(B) and toluene(T) change with temperature and molar composition at constant pressure. Use the sliders to vary the temperature and overall mole fraction of benzene. Use the buttons to view the temperature-composition diagram (T-x-y), the fugacity-temperature plot, or both plots at once.

 

Try to answer these questions before determining the solution with the simulation:

1. As temperature increases can the fugacity of one component increase and the fugacity of another component decrease? 
2. As temperature increases at constant pressure for an ideal gas mixtures, what happens to the fugacities of each component?
   

Simulation: Fugacities in a Can of Soda

The fugacities of water and carbon dioxide are calculated as a function of temperature for a closed container, which is modeled as a can of soda. The concentrations of the two components are calculated in both the liquid and the gas phases. Change the temperature inside the can with a slider. 

Try to answer these questions before determining the solution in the simulation:

1. What happens to the fugacities as the temperature increases? What happens to the pressure?
2. Which of the fugacities are higher, CO2 or H2O? Are the fugacities in equilibrium?