CHM 11600 Lecture Notes - Lecture 24: Enthalpy, Calorimetry, Spontaneous Process

• School: Purdue University
• Department: Chemistry
• Course: CHM 11600
• Professor: Nash/ Wasserman

Document Summary

Chm 11600 - general chemistry - lecture 24_gibbs free energy. Gsystem = hsystem - t ssystem (units: j/k) Suniverse > 0 for a spontaneous process. Suniverse < 0 for a nonspontaneous process. Suniverse = 0 for a reaction at equilibrium. G < 0 for a spontaneous process. G > 0 for a nonspontaneous process. G = 0 for a reaction at equilibrium. G and the work a system can do. G is the maximum useful work done by a system during a spontaneous process at constant temperature and pressure. G is the minimum work done to a system to make a nonspontaneous process occur at constant t and p. A spontaneous reaction( g < 0) will do work on the surroundings(-w). A nonspontaneous reaction ( g > 0) will only occur if surroundings do work on the system (+w). A reaction at equilibrium ( g = 0) can no longer do any work.