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Chem_208_23_07_web

Chem_208_23_07_web - Mean 66.5/100 Std Dev 17.5 Median...

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1 PS 9 Due Friday Today: Finishing Ch. 19. Thursday: Electrochemistry Ch 20.1-20.2 Mean - 66.5/100 Std Dev - 17.5 Median – 69.0/100
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2 The Standard Gibbs Free Energy Change, G o G o = H o - T S o The standard free energy of formation G o f is the free energy change for formation of a substance in its standard state. Zero of free energy defined by elements in their standard states. Calculations involving G o are like those involving H o . What is G for the condensation of 1 mole of water at the following T: a) 25 o C? b)200 o C? b) 100 o C? H 2 O (g) H 2 O (l) Recall: S o = - 118.9 J/mol K G f o [(H 2 O(l)] = -237.1 kJ/mol; G f o [(H 2 O(g)] = -228.6kJ/mol H f o [(H 2 O(l)] = -285.8kJ/mol; H f o [(H 2 O(g)] = -241.8kJ/mol a) G o = -8.5 kJ b) G= + 12.2 kJ c) G = 0 kJ
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3 Gibbs Free Energy Change G = H - T S • If G < 0 (negative), the process is spontaneous. • If G > 0 (positive), the process is nonspontaneous. • If G = 0 (zero), the process is at equilibrium.
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4 System: G = H - T S < 0 for spontaneity G = Maximum work (done on surroundings) acetone TATP + heat explosive decomposition
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