Chpt%2020-2

Chpt%2020-2 - Free Energy 20.3, 20.4 Last time G = H - TS G...

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Unformatted text preview: Free Energy 20.3, 20.4 Last time G = H - TS G is negative means spontaneous G is positive means non-spontaneous S is negative means order S is positive means disorder Example Is this reaction spontaneous? C 3 H 8 ( g ) + 5 O 2 ( g ) 3 CO 2 ( g ) + 4 H 2 O( g ) A. Always Spontaneous B. Depends on Temperature C. Never Spontaneous If you put CO 2 and H 2 O in a room long enough, will you ever get propane? Example Solve for the G of this reaction at T = 25 Celsius: S( g ) + O 2 ( g ) SO 2 ( g ) H = -575.8 kJ/mol S = -124.9 J/mol-K Another Example Solve for the G of this reaction at T = 25C: H 2 O( l ) H 2 O( s ) H = -6.012 kJ/mol S = -22.0 J/mol-K At what T does G = 0? Next point When G = 0, the system is at equilibrium Both the forward and reverse occur When G < 0, spontaneous reaction, the forward reaction dominates When G > 0, non-spontaneous reaction, the reverse reaction dominates More G...
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This note was uploaded on 11/29/2011 for the course CHEM 1212 taught by Professor Dockery during the Fall '08 term at Kennesaw.

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Chpt%2020-2 - Free Energy 20.3, 20.4 Last time G = H - TS G...

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