L24_Thermo3

L24_Thermo3 - >80: A 75-80: A-/B+ range 67-75: B 55-67: C...

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>80: A 75-80: A-/B+ range 67-75: B 55-67: C <55: did not pass
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When a process results in an increase in the number of microstates available to the system, the change in entropy is 1. positive. 2. negative. 3. zero. 4. All of these are possible, depending upon specific circumstances. 5. There is no connection between entropy and the number of microstates available to the system.
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Ludwig Boltzmann defined an equation for the probability and entropy: where S is entropy Ω is the number of micro states available for a state of a system (both energy and position) k b is the Boltzmann constant: Ω = ln b k S a b N R k =
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Water Ice Examples of processes where positional entropy increases: - gas expansion - salt dissolving - diffusion of gases/liquids - ice melting - evaporation Positional entropy
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Positional entropy and volume (observe gas expansion: liquid nitrogen demo) When volume increases - more positional arrangements are possible Calculate change in in entropy Δ S for gas expansion, V 2 =2V 1
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This note was uploaded on 07/22/2008 for the course CHEM 115b taught by Professor Reisler during the Spring '08 term at USC.

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L24_Thermo3 - >80: A 75-80: A-/B+ range 67-75: B 55-67: C...

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