110214 - Chemical equilibrium (Chapter 6 p.193-203)...

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1 CHM3400 - Lecture 16 –Feb ±14 Chemical equilibrium (Chapter 6 p.193-203) equilibrium and Δ G equilibrium and mixing enthalpy and entropy
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2 Gas-phase reaction equilibrium Examples of reactions, where an equilibrium is attained: cis-trans isomerization racemization cyclopropane ring opening propene aA(g) bB(g) At equilibrium Forward reaction is spontaneous Reverse reaction is spontaneous
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3 Relating Δ G to equilibrium constant o A o A A P P RT ln + = μ μ o B o B B P P RT ln + = μ Chemical potentials: A B r a b G μ− = Δ Free energy of reaction: o A o B o A o B r P P aRT P P bRT a b G ln ln + = Δ μμ o A o B o r a b G = Δ ( ) () a o A b o B o r r P P P P RT G G / / ln + Δ = Δ At equilibrium, Δ r G = 0: ( ) () P a o A b o B o r K RT P P P P RT G ln / / ln = = Δ Equilibrium constant
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4 Reason for non-total reaction If there were no mixing, reaction product of lower energy would be formed exclusively: Where will equilibrium point be for reagent and product that have identical chemical potentials?
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This note was uploaded on 05/29/2011 for the course CHM 3400 taught by Professor Seabra during the Spring '08 term at University of Florida.

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110214 - Chemical equilibrium (Chapter 6 p.193-203)...

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