CHM116 week 9 Tues probs - H rxn , S rxn , and G rxn at 298...

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Predict the conditions that will make each of the following spontaneous (all, hi T, lo T) a) H 2 O ( g ) H 2 O ( l ) b) CO 2 ( s ) CO 2 ( g ) c) H 2 ( g ) 2 H ( g ) d) 2 NO 2 ( g ) 2 NO ( g ) + O 2 ( g ) (endothermic) 1. Problems for Tues 10/26 Name What is the molar entropy of a pure crystal at 0 K? Explain the significance of you answer with a sentence. 2. Consider the following reaction: CaCO 3 ( s ) CaO ( s ) + CO 2 ( g ) Estimate Δ G º for this reaction at each of the following temperatures and predict whether the reaction will be spontaneous. (Assume that Δ H º and Δ S º do not vary much over the range of temperatures) a) 298 K b) 1055 K c) 1455 K 5. For each pair of substances below, choose which you’d expect to have higher standard molar entropy ( S º). Breifly note why. a) NaNO 3 ( s ) ; NaNO 3 ( l ) b) CH 4 ( g ) ; CH 3 CH 3 ( g ) c) Br 2 ( l ) ; Br 2 ( g ) d) Br 2 ( g ) ; F 2 ( g ) e) PCl 3 ( g ) ; PCl 5 ( g ) f) CH 3 CH 2 CH 2 CH 3 ( g ) ; SO 2 ( g ) 3. In photosynthesis, plants form glucose (C 6 H 12 O 6 ) and oxygen from carbon dioxide and water. Write a balance chemical equation for photosynthesis below and use the appendix to calculate Δ
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Unformatted text preview: H rxn , S rxn , and G rxn at 298 K. Since this reaction is not spontaneous, how can it occur? 4. Calculate G rxn for the following reaction using the two reactions (and their G rxn ) below. CaCO 3 ( s ) CaO ( s ) + CO 2 ( g ) Ca ( s ) + CO 2 ( g ) + O 2 ( g ) CaCO 3 ( s ) G rxn = -734.4 kJ 2 Ca ( s ) + O 2 ( g ) 2 CaO ( s ) G rxn = -1206.6 kJ 6. Calculate G rxn for the following reaction at 298 K where the partial pressures were not all 1 atm, but rather the conditions listed below. CO 2 ( g ) + CCl 4 ( g ) 2 COCl 2 ( g ) P CO 2 = 0.112 atm P CCl 4 = 0.174 atm P COCl 2 = 0.774 atm 7. Consider the following reaction: I 2 ( g ) + Cl 2 ( g ) 2 ICl ( g ) K p = 81.9 at 298 K 8. Calculate G rxn for the reaction at 298 K under each of the following conditions: a) at standard conditions b) at equilibrium c) P I 2 = 0.325 atm P Cl 2 = 0.221 atm P ICl = 2.55 atm...
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This note was uploaded on 05/15/2011 for the course CHM 116 taught by Professor Matchett during the Fall '11 term at Grand Valley State University.

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CHM116 week 9 Tues probs - H rxn , S rxn , and G rxn at 298...

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