Ch04-A-entropy

Ch04-A-entropy - Chapter 4: A: Entropy, Second law CHM 341...

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Unformatted text preview: Chapter 4: A: Entropy, Second law CHM 341 Elementary Physical Chemistry Fall 2009 Ranko Richert ? never observed , but this is not violating the First law of thermodynamics: typical observation conversion of work to heat: molecular view: concept of entropy S and the direction of spontaneous change all particles move along + z direction (instead of x , y , z ): probability for 1 particle: 1/6 probability for 10 particles: 1/6 10 10-8 probability for 1 mol of particles: 1/6 1 mol 6 1 6 1 23 10 022 . 6 mol 1 = Second law of thermodynamics: No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work. The entropy of an isolated entity, system plus surrounding, increases in the course of a spontaneous change: S + S sur > 0 emperature constant t process reversible T dq dS rev = entropy S is state function: S B = S A S A S B A: irreversible expansion B: reversible expansion ( )...
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This note was uploaded on 10/10/2009 for the course CHM 341 taught by Professor Richert during the Spring '08 term at ASU.

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Ch04-A-entropy - Chapter 4: A: Entropy, Second law CHM 341...

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