Lecture11, 2-4-08 Third Law

Lecture11, 2-4-08 Third Law - Presidential Primary Tuesday...

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Presidential Primary Tuesday Nov 5 Polls are open on Tuesday from 7 a.m. to 8 p.m. Polling place and general election information www.sa.ucsb.edu/voterreg or http://www.sbcvote.com/elect/resources/root0205 /pollplac.htm or by calling 568-2200. The Official California Voter Information Guide can be accessed at http://www.sos.ca.gov/elections/elections.htm .
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Overview of Thermodynamics •Systems – open, closed, isolated •State functions – Δ E, Δ H, Δ S don’t depend on pathways for processes, zero for cyclic process •Reversible process = infinite small steps •Irreversible process = spontaneous process •A spontaneous cyclic process is not reversible!
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Application of 2 nd Law to Chemical Reactions • Determine if a reaction is spontaneous • Determine the equilibrium constant H 2 (g, 1atm) + ½ O 2 (g, 1atm) H 2 O (g, 1atm) • Is the reaction spontaneous? • “Yes” immediately tells us two things Δ S – q irr /T > 0 (for standard states) •K eq > 0 (for standard states) • Goal: Start with knowledge of Δ S – q irr /T to determine if reaction is spontaneous and value of K eq .
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Spontaneous, Cyclic and Reversible Chemical Reactions H 2 (g) + ½ O 2 (g) H 2 O ( l ) spontaneous
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Lecture11, 2-4-08 Third Law - Presidential Primary Tuesday...

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