LEC 24 CHAP 19 - Lecture 24 Determination of Stotal for a...

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TOUPADAKIS Lecture 24 Chapter 19 Lecture 24 Determination of Δ S total for a Chemical Change. Free Energy (G) and Free Energy Change ( Δ G). Criterion for Spontaneous Change based on Δ G system .
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TOUPADAKIS Lecture 24 Chapter 19 Determination of Δ S total for a Chemical Change Δ S system = Δ S reaction = S ° (products) - S ° (reactants) Δ S total = Δ S system + Δ S surroundings Δ S surroundings = - Δ H reaction T surroundings
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TOUPADAKIS Lecture 24 Chapter 19 Problem 1 Consider the oxidation of iron metal to Fe 2 O 3 solid. By determining the sign of Δ S total , show that the reaction is spontaneous at 25 o C. 4 Fe(s) + 3 O 2 (g) 2 Fe 2 O 3 (s) S o (JK -1 mol -1 ) 27.3 205.0 87.4 Δ H f o (kJmol -1 ) 0 0 -824.2 Answer: Δ S total = + 4980 JK -1 .
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TOUPADAKIS Lecture 24 Chapter 19 Free Energy (G) and Free Energy Change ( Δ G) We want to develop/find a new criterion for spontaneity. Why the previous criterion:
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LEC 24 CHAP 19 - Lecture 24 Determination of Stotal for a...

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