Lec09_drobny_11 - Lecture 9: Gibbs Free Energy Reading:...

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Lecture 9: Gibbs Free Energy • Reading: Zumdahl 10.7, 10.9 • Recommended Problems: 10.51, 10.53, 10.55, 10.57 • Outline – Defning the Gibbs Free Energy ( Δ G) – Calculating Δ G – Pictorial Representation o± Δ G
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Defning Δ G • Recall, the second law oF thermodynamics: Δ S univ = Δ S total = Δ S sys + Δ S surr • Also recall: Δ S surr = - Δ H sys /T • Then , Δ S total = Δ S sys - Δ H sys /T ± ΤΔ S total = -T Δ S sys + Δ H sys
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Defning Δ G (cont.) • We then defne: Δ G = -T Δ S total • Then: • Or : Δ G = -T Δ S sys + Δ H sys Δ G = The Gibbs Free Energy (constant P)
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Δ G and Spontaneous Processes • Recall from the second law the condititions of spontaneity: • Three possibilities: – If Δ S univ > 0…. .process is spontaneous – If Δ S univ < 0…. .process is spontaneous in opposite direction. – If Δ S univ = 0….equilibrium • In our derivation of Δ G, we divided by -T; therefore, the direction of the inequality changes relative to entropy.
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Δ G and Spontaneous Processes (cont.) • Three possibilities: – If Δ S univ > 0…. .process is spontaneous – If Δ
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This note was uploaded on 01/18/2012 for the course CHEM 152A taught by Professor Chiu during the Fall '12 term at University of Washington.

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Lec09_drobny_11 - Lecture 9: Gibbs Free Energy Reading:...

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