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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Gibbs Free Energy Change G = H - T S •I f G < 0 (negative), the process is spontaneous.
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Chem_208_23_07_web - Mean - 66.5/100 Std Dev - 17.5 Median...

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