Lecture 18

Lecture 18 - The Concept of Entropy(S Open the...

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1 The Concept of Entropy (S) Initially: Right side evacuated Open the Valve (spontaneous process) Gas flows into evacuated region Non spontaneous process Spontaneous Processes are associated with increasing number of accessible positional or energy states (increased entropy). For an ideal gas: Δ E = 0, Δ H = 0 for expansion. The process is not driven by energy or enthalpy
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2 Consider 4 molecules in a two-bulbed flask 1 microstate 4 microstates 6 microstates
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3 Spontaneity and Probability Initially: Right side evacuated Open the Valve (spontaneous process) Gas flows into evacuated region Non spontaneous process The probability of finding all of the molecules in the left bulb depends upon the total number of molecules in the bulbs .
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4 2 Molecules in Bulbs There are 4 possible microstates. Probability of finding both molecules in left bulb = ¼ = 0.25
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5 Probability • The probability of occurrence of a particular arrangement (state) depends on the number of ways (microstates) in which the arrangement can be achieved.
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This note was uploaded on 04/16/2009 for the course CHEM 2150 taught by Professor Chirik,p during the Fall '08 term at Cornell.

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Lecture 18 - The Concept of Entropy(S Open the...

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