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05 - Chem204 Lecture5 Equilibrium As a concept(point where...

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Chem 204 – Lecture 5 Equilibrium – As a concept (point where free energy between two phases is the same), we know! Δ G = 0 = G(s) - G(l) Application to a chemical reaction should not come as a surprise. We reach equilibrium when: Δ G r = G(products) – G(reactants) =0 As with phase equilibria, the equilibrium for a reaction is also dynamic. How is phase equil. dynamic?
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Lecture 5 – page 2 Dynamic equilibrium means the rate of product formation is equal to reverse rate, i.e. formation of reactants. Demo (Orange and Blue). I will use this, , to represent equilibrium. Thus 2A + B C + 2D is a balanced chemical reaction in equilibrium and therefore: Δ G r = G m (C)+2G m (D) – (2G m (A)+G m (B)) = 0 How do thermodynamics determine the equilibrium distribution of reactants, products? Is it in equilibrium?
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Lecture 5 – page 3 Consider this simple gas phase reaction at equilibrium: A 2 (g) 2A(g); Δ G r = 2G m (A) – G m (A 2 ) = 0 0=2G m °(A)+2RTln(P(A)/P°)–(G m °(A 2 )+RTln(P(A 2 )/P°)) 0 = Δ G r ° + RT ln (P(A) 2 /P(A 2 ));
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