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 ( ! G) – Calculating ! G – Pictorial Representation o± ! G
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Defning ! G • Recall, the second law oF thermodynamics: ! S univ = ! S total = ! S sys + ! S surr • Also recall: ! S surr = - ! H sys /T • Then , ! S total = ! S sys - ! H sys /T ± "! S total = -T ! S sys + ! H sys
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Defning ! G (cont.) • We then defne: ! G = -T ! S total • Then: • Or : ! G = -T ! S sys + ! H sys ! G = The Gibbs Free Energy (constant P)
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! G and Spontaneous Processes • Recall from the second law the condititions of spontaneity: • Three possibilities: – If ! S univ > 0…. .process is spontaneous – If ! S univ < 0…. .process is spontaneous in opposite direction. – If ! S univ = 0….equilibrium • In our derivation of ! G, we divided by -T; therefore, the direction of the inequality changes relative to entropy.
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! G and Spontaneous Processes (cont.) • Three possibilities: – If ! S univ > 0…. .process is spontaneous – If ! S univ < 0…. .process is spontaneous in opposite direction.
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Lec09_drobny_11 - Lecture 9: Gibbs Free Energy! ! Reading:...

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