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# Lecture22_upload - Free Energies of Formation Note that Gof...

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Free Energies of Formation Note that ∆Gof for an element = 0 G o = ∑ ∆ G of(products) - ∑ ∆ G of(reactants)

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H2O ( l ) H2O ( g ) Calculate G o at 298K. Is the process spontaneous at this temperature (when both reactants and products are in their standard states)? Example: B. Yes, as evidenced by the fact that a puddle of liquid water at 298 K will eventually disappear. A. No, because G o > 0
T = 298K 1:00 p.m. 2:00 p.m. 3:00 p.m.

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G = G o + R T ln Q At equilibrium, G = 0 G o = - R T ln Q eq [C] c [D] d [A] a [B] b Q eq = K eq G o = - R T ln K eq [C] c [D] d [A] a [B] b
G Q K e q 1 G o G o > 0 0 K eq < 1 Reaction is reactant- favored Γ = ∆ Γ ο + Ρ Τ λν Θ Γ ο = -Ρ Τ λν Κ εθ

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P H2O = 1bar Liquid water G = G o T = 298K P H2O < 1bar Γ = σμαλλερ τηαν ∆ Γ ο (χλοσερ το 029. Liquid water later P H2O << 1bar Γ = 0 Liquid water Vapor pressure of water at 298K later Equilibrium
T = 298K P H2O = P vap Γ = 0 Liquid water Vapor pressure of water at 298K later Equilibrium P H2O < P vap G =

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Lecture22_upload - Free Energies of Formation Note that Gof...

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