CHEM102 Lecture Notes - Lecture 27: Gibbs Free Energy, Dan Piraro, Boiling Point

• School: University of Alberta
• Department: Chemistry
• Course: CHEM102
• Professor: Yoram Apelblat

Document Summary

The golden bears won their second consecutive cis hockey championship . The cartoon notwithstanding, if you drink, drink responsibly! S = 40 + 214 93 = + 161. 2 h2 (g) + o2 (g) 2 h2o (g) 2 mol of gas are produced vs. 3 mol gas started with. S = 2 (189) 2 (131) 205 = 89. Based on the sign of s you may conclude that the rxn is non spontaneous. Let me give an example for a spontaneous rxn with apparently a negative entropy. The 2nd law of thermodynamics = the entropy of the universe tends to a maximum. i. e. increases all the time for spontaneous processes. Suniverse = ssystem + ssurroundings > 0 spontaneous. The problem is that you need ssurroundings which is inconvenient to calculate. Can"t measure h or g, only h and g. G portion of enthalpy change free do useful work. T s portion of energy that is lost (efficiency