Chem208_Lecture_22_BW

Chem208_Lecture_22_BW - discuss spontaneity in terms of the...

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1 Today: Thermodynamics (Chapter 19) - finish Entropy - Free Energy Pick up or download PS9 today; Due Friday, 4/18, at 2:00
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2 Review S can be expressed in terms of several state functions: T, V, P For spontaneous process: S tot = S univ = S surr + S sys > 0 A system is more likely to be found is a condition that corresponds to more microstates
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3 • S°, standard molar entropy, is the absolute entropy possessed by a substance in its standard state • S° increases as the complexity of a substance increases
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4 Can we express spontaneity in terms of thermodynamic properties of the system only? sys = sys -T sys The importance of the concept of Free Energy is that, provided we can accept the limitation to changes at constant P and T, we can now
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Unformatted text preview: discuss spontaneity in terms of the thermodynamic properties of the system . 5 Qualitative Meaning of Free Energy • ∆ G is the amount of energy released during a reaction that can be used to do work &( ∆ G = – w) 6 Standard Free Energy of Formation, ∆ G f ° • Analgous to ∆ H f °; the elements in their standard states serve as the reference against which values of ∆ G f ° ( and ∆ H f °) for substances are measured • ∆ G f ° = 0 for elements in their standard states Calculate ∆ G° for the oxidation of NH 3 ( g ) by O 2 ( g ) to produce NO ( g ) and H 2 O ( l )...
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This note was uploaded on 03/29/2009 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell.

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Chem208_Lecture_22_BW - discuss spontaneity in terms of the...

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