L30S09_FreeEnergy_EquiK_04-08-09

L30S09_FreeEnergy_EquiK_04-08-09 - Chem 1A L31"Free...

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Unformatted text preview: Chem 1A, L31: "Free Energy and K" Summary ©A.Pines,M.Kubinec,UCB L30-1 Summary Free Energy and Equilibrium aA+bB ∆ G˚ > 0 Spontaneous cC+dD ∆ G˚ = 0 ∆G˚, K K<1 K=1 ∆ G˚ < 0 Spontaneous K>1 ∆G˚= ­RT ln K ©A.Pines,M.Kubinec,UCB K = exp ( -∆G˚) RT L30-3 ©A.Pines,M.Kubinec,UCB 1 Chem 1A, L31: "Free Energy and K" ChemQuiz© 30.1 What are ∆G˚ and K for H2O(l) H2O(g) at 25˚C? A) ∆G˚< 0 K>1 ©A.Pines,M.Kubinec,UCB B) ∆G˚= 0 K<1 C) ∆G˚> 0 K<1 L30-4 Free Energy and Temperature ∆G˚ = ∆H˚ - T∆S˚ ∆S˚ lnK = -∆H˚ 1 + R RT Exo Endo lnK Endo K Exo 1/T ©A.Pines,M.Kubinec,UCB T L30-6 Free Energy and Temperature ∆Gº = ∆Hº -T ∆Sº lnK = - ∆ Hº 1 ∆S º + RT R ∆G˚ intercept = ∆H˚ slope = -∆S˚ ∆ S˚ ln K intercept = R slope = R -∆H˚ T Endo ©A.Pines,M.Kubinec,UCB Endo L30-7 1/T ©A.Pines,M.Kubinec,UCB 2 Chem 1A, L31: "Free Energy and K" - ∆ Hº 1 ∆S º + lnK = LnK and Free ∆Gº = ∆Hº -T ∆Sº Energy R RT ∆Gº T ∆Hº ∆Sº ∆Hº∆Sº ∆Hº∆Sº ∆Hº∆Sº lnK lnK +- -- ++ -+ 1/T L30-8 ©A.Pines,M.Kubinec,UCB ChemQuiz© 30.2 Shown is a plot of lnK vs 1/T lnK for I2 (s) I2 (g). Which is (s) (g). the corresponding plot for CO2 (s) CO2 (g) ? 1) 2) 3) lnK lnK 1/T ©A.Pines,M.Kubinec,UCB L30-9 - ∆ Hº 1 ∆S º + lnK = LnK and Free ∆Gº = ∆Hº -T ∆Sº Energy R RT ∆Gº T ∆Hº ∆Sº ∆Hº∆Sº ∆Hº∆Sº ∆Hº∆Sº lnK lnK +- -- ++ -+ 1/T L30-11 ©A.Pines,M.Kubinec,UCB ©A.Pines,M.Kubinec,UCB 3 Chem 1A, L31: "Free Energy and K" Free Energy and the Reaction Quotient G(Reactants) ∆G = G(P) – G(R) ∆G < 0 ∆G = 0 ∆G > 0 Q<K Q=K Q>K G = ∆G° ° RT lnK = G(Products) ∆∆G = ∆G+ + RT lnQ 0 lnK ©A.Pines,M.Kubinec,UCB L30-12 ChemQuiz© 30.3 What are ∆G and K at equilibrium at 25˚C for H2O(l) H2O(g) ? A) ∆G < 0 K>1 ©A.Pines,M.Kubinec,UCB B) ∆G = 0 K<1 C) ∆G > 0 K<1 L30-13 ChemQuiz© 30.4 [xi] Which is true at t1? A (aq) + 2 B (aq) (aq) A) Q > K ©A.Pines,M.Kubinec,UCB C (aq) (aq) t1 t B) Q = K C) Q < K L30-15 ©A.Pines,M.Kubinec,UCB 4 Chem 1A, L31: "Free Energy and K" Lecture Complete ©A.Pines,M.Kubinec,UCB L30-17 ©A.Pines,M.Kubinec,UCB 5 ...
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L30S09_FreeEnergy_EquiK_04-08-09 - Chem 1A L31"Free...

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