Lecture 17 - Ch. 10: Spontaneity, Entropy and Free Energy...

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1 Ch. 10: Spontaneity, Entropy and Free Energy H 2 O (l) H 2 O (g) Δ H = +44.0 kJ/mol Is this process spontaneous? At 110 o C: Yes At 20 o C: No Spontaneity cannot be predicted from Δ H alone. • If a process is spontaneous, the reverse process is nonspontaneous. • Only spontaneous processes will occur without action from outside the system (external action). • Nonspontaneous processes require that some external action be applied. How can we predict whether or not chemical or physical processes will occur spontaneously?
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2 Spontaneity and Thermodynamics: - thermodynamics tells us the direction in which reaction will occur. - thermodynamics says nothing about the speed (rate) of reaction.
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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:
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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 University (Engineering School).

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Lecture 17 - Ch. 10: Spontaneity, Entropy and Free Energy...

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