6. Use the reaction below and the information provided to answer the questions that follow. 2 PbS (s) + 3 O2 (g) 2 PbQ (

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6 Use The Reaction Below And The Information Provided To Answer The Questions That Follow 2 Pbs S 3 O2 G 2 Pbq 1 (131.26 KiB) Viewed 13 times

6. Use the reaction below and the information provided to answer the questions that follow. 2 PbS (s) + 3 O2 (g) 2 PbQ (s) + 2 SO2 (g) Substance AHot @ 298K (kJ/mol) So @ 298K (J/mol K) Pb (s)-98.7 91.3 O2 (g) --- 205 PbQ (s)-217.3 68.70 SO2 (g) -296.9 248.5 (a) Is this reaction exothermic or endothermic? Justify with a calculation. (b) Which species have more entropy, the products or the reactants? Does the entropy of the system (the reaction) increase or decrease? (Calculate AS system) (c) Calculate ASunix at 298K. (d) At what temperatures is this reaction spontaneous? (e) Prove your answer to (d) by calculating ASuixat a temperature higher than your predicted temperature and a temperature lower than your predicted temperature. Explain. | 7. Complete the following: Reactions that are spontaneous at low temperature, but not at high temperature have AH values that are and AS values that are 8. A reaction has ASunix = 70 J/K at 500K. The ASon is -405 J/K. (a) Is the reaction spontaneous at 500K (b) Is the reaction endothermic or exothermic? (c) Is the reaction spontaneous at 300K? Predict and then calculate ASunix.