Chpt 20-2

# Chpt 20-2 - Free Energy 20.3 20.4 Last time G = H TS G is...

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Free Energy 20.3, 20.4

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Last time ∆G = ∆H - T∆S ∆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?

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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?

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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
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Chpt 20-2 - Free Energy 20.3 20.4 Last time G = H TS G is...

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