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Lec09_drobny_11

# 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 – Defining the Gibbs Free Energy ( Δ G) – Calculating Δ G – Pictorial Representation of Δ G

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Defining 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
Defining Δ G (cont.) We then define: 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.
Δ G and Spontaneous Processes (cont.) Three possibilities: – If Δ S univ > 0…..process is spontaneous – If

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Lec09_drobny_11 - Lecture 9 Gibbs Free Energy Reading...

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