# entropy1 - a write a balanced equation for this reaction b...

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CHEM 2B: Entropy Clemens 1. Which member of the following pairs has the greatest entropy? a) NH 3 (l) or H 2 NNH 2 (l) b) CO 2 (g) or CO 2 (s) c) PbS (s) or PbF 2 (s) d) H 2 (g) at 25 o C or H 2 (g) at 100 o C 2. Consider the following reaction: C (s, graphite) + CO 2 (g) 2 CO (g) Δ H rxn = 172 kJ a) is this reaction endothermic or exothermic? b) would this reaction be predicted to have a positive or negative Δ S rxn ? c) would you expect this reaction to be spontaneous at all temperatures? Will it be spontanteous at any temperatures? 3. Calculate the boiling point of acetone given that Δ H vap = 29.1 kJ/mol and Δ S vap = 88.3 J/molK. 4. Ammonia (g) reacts with fluorine gas to produce hydrogen fluoride gas and dinitrogen tetrafluoride gas.

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Unformatted text preview: a) write a balanced equation for this reaction. b) Calculate Δ G o for this reaction G o f (kJ/mol) NH 3-16.4 HF -275.4 F 2 N 2 F 4 79.9 5. Consider the following reaction: 2 Fe 2 O 3 (s) + 3 C (graphite) 4 Fe (s) + 3 CO 2 (g) a) Determine Δ H o rxn at 25 o C. b) Determine Δ S o rxn at 25 o C. c) Determine Δ G o rxn at 25 o C d) Determine Δ G o rxn at 600 o C e) At what temperature does this reaction become spontaneous? f) Would you consider this reaction to be enthalpy or entropy-driven at 25 o C g) is this reaction predicted to be spontaneous at 25 o C? at 600 o C? H o f (kJ/mol) S o (J/molK) Fe (s) 27.8 Fe 2 O 3 (s0 -824.2 87.4 C (s, graphite) 5.74 CO 2 (g) -393.5 213.7...
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