Section 20.1 . ?Thermodynamics tells us NOTHING about the rate of reaction. The study of rates and why some reactions are fast and others are slow is called kinetics (Ch. 15.). Section 20.2 Entropy . Entropy, S: Measure of dispersal or disorder. ? Can be measured with a calorimeter. Ass
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ØEntropy usually increases when a pure liquid or solid dissolves in a solvent.
Entropy increases when a dissolved gas escapes from a solution
Can also relate surroundings to the system!
= - DHsystem / T
= DHsystem - TDSsystem
DGs are additive!
If not at standard conditions,
DG = DGo + RT ln Q
(Equilibrium is characterized by the inability to do work.)
At equilibrium, Q = K and DG = O
Therefore, substituting into previous equation gives 0 = DGo + RT ln K and
DGo = - RT ln K (can use Kp or Kc)