Lecture-30 - spontaneous Second Law of Thermodynamics: S...

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Chem111 Fall, 2005 thermo-19 The container is immersed in a water bath, so that the whole process occurs at Δ T = 0 spontaneous in thermodynamics means that the process will happen spontaneous instantaneous Why does the gas expand? Δ E = Δ H = w = q = Æ Entropy! measure of disorder related to probability Lecture 30: Thermodynamics Entropy vacuum remove the partition gas at some pressure P the gas spontaneously redistributes between the two chambers
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Chem111 Fall, 2005 thermo-20 Two flasks connected by a stop-cock … one particle of gas two particles of gas three particles of gas N particles of gas
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Chem111 Fall, 2005 thermo-21 Entropy = measure of randomness increase randomness
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Unformatted text preview: spontaneous Second Law of Thermodynamics: S total 0 S is a state function S = S f- S i and we know absolute entropies ! Absolute Entropies S Third Law of Thermodynamics: The entropy of any pure substance in its equilibrium state approaches zero at the absolute zero of temperature Standard molar entropy (J K-1 mol-1 ) S o = 293.15 P c dT + S( ) T phase changes tabulated with H o f in Appendix D ALL S for pure substances > 0 S (gas) > S (liquid) > S (solid) S (heavy) > S (light) S (less ordered) > S (more ordered) Chem111 Fall, 2005 thermo-22 S (T 1 ) > S (T 2 ) where T 1 > T 2...
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This note was uploaded on 02/08/2010 for the course CHEM 111 taught by Professor Kenney during the Spring '08 term at Case Western.

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Lecture-30 - spontaneous Second Law of Thermodynamics: S...

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