CHEN 3101 Chapter Notes - Chapter 14: Ideal Gas, Phase Rule, Thermodynamic Equilibrium
Document Summary
A system is in thermodynamic equilibrium if no macroscopically observable change occurs when it"s isolated from its surrounding: temperature needs to be uniform throughout the system, or each part of the system are in thermal contact. Ignoring influence of gravity, the energy balance for a system is: where (or. Incorporating in the gibbs function, the equation becomes: And that at any specified temperature and pressure: For a multicomponent system, gibbs function can be written as: G = g(t, p, n1, n2, , nj) It can be found with: where i, chemical potential, is: The equation can also be rearranged to form: ( equilibrium criterion) Chapter 14: chemical and phase equilibrium 4/7/2015 which equals 0 at equilibrium. The chemical potential of a single phase of a pure substance is: The gibbs function of component i in an ideal gas mixture is:
