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Lecture14

# Lecture14 - Gibbs Free Energy Reading 17.6 to 17.9 HW P808...

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Gibbs Free Energy Reading: 17.6 to 17.9 HW: P808 # 31, 33,35, 47, 49, 51, 53, 63, 65, 69

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2 Law Thermodynamics Entropy of the universe always increases in product-favored change S universe = S system + S surroundings S universe is always positive in product-favored change S surr = - H sys / T *enthalpy of reaction determines entropy change of surroundings
Gibbs Free Energy ( G) G sys = -T S univ Product favored = decrease in G - G = product favored + G = reactant favored

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G = H - T S *Predicting direction of reaction - ∆H exo, favorable + ∆H endo, unfav - ∆S less disorder, unfavorable - ∆G at low temp, enthalpy driven + ∆G reactant favored + ∆S more disorder, favorable - ∆G product favored -∆G at high temp, entropy driven
Calculating Method 1: G° = H ° - T S ° Method 2: Reaction 1 + Reaction 2 = Reaction 3 G 1 + G 2 = G 3 Method 3: G ∑∆ f ° products - G ∑∆ f ° reactants G f ° values – Appendix J

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CH (g) + 2 O (g)
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