Disc_Sect_6 - Chemistry 104 B/D Key Ideas from Lecture #6:...

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Chemistry 104 B/D Discussion Section Worksheet Discussion Section #6 Key Ideas from Lecture #6: Δ S universe : Gibb’s Free Energy ( Δ G): Third Law of Thermodynamics: Let’s think about these concepts for a bit. .. Think back to our first day of lecture, when we burned some Cheetos using a bit of liquid oxygen. Based on what you saw (and your chemical intuition), what will the sign be for the following functions: Δ H, Δ S system , Δ S surroundings , Δ S universe , Δ G What would happen to the sign of Δ G if we dropped the temperature (by a little or a lot)? Is there any temperature range where this reaction would be non-spontaneous? Problems: Hour Exam I, Fall 2006, #4 Consider the following information: Fe 2 O 3 (s) + 3 H 2 (g) Æ 2 Fe (s) + 3 H 2 O (g) performed at 25 o C Δ H o rxn = 100 kJ Δ S o rsn = 138 J/K Under standard conditions will this reaction be spontaneous, non-spontaneous, at equilibrium, or is more information is needed? Stuck?
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Disc_Sect_6 - Chemistry 104 B/D Key Ideas from Lecture #6:...

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