| Chapter 16 |
| ^ H = change in enthalpy-- if it's postive then nonspontaneous neg- spontaneous ^ S = change in entrophy- if postive spontaneous neg- non spntaneous ^G = change in free energy- if positive- non spontaneous neg- spontaneous ^ T = change in temperature |
| ^H= E H products - E H reactants ^ S = E S products - E S reactants ^S universe = ^s reaction + ^S surroundings ^G = ^H - T^S 2nd law of thermodynamics- entrphy of the universe is increasing 3rd law of thermodynamics- the entropy is zero at zero K for a perfect crystal |
| B--> C is spontaneous ^G reaction = -31.4 kj/mol ^G f* c = 176.4 J/mol What is the standard free energy of compound B? ^G = ENp ^Gp - EnR ^GR -31.4 = 1764 - B B = 207.8 kj/mol |
| Example: |