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Unformatted text preview: course of a spontaneous change. or The entropy of an isolated system increases in the course of a spontaneous change. Isolated System: no interactions with surroundings 6 Statistical View of Entropy Boltzmann: S = k ln W k: Boltzmann constant; k = 1.38 x 1023 J/K (R = N A k) W: # of microstates of the same energy available to the system 7 ∆ S = q rev /T or dS = dq rev /T = C p dT/T ∆ S = C p ln (T f /T i ) 8 Third Law of Thermodynamics The entropy of a pure, perfect crystal at 0 K is zero. Standard Entropy, S°, is the absolute entropy of a substance in its standard state. 9 Calculate ∆ S° 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.
 Spring '07
 DAVIS,F
 Chemistry

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