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TA practice exam 3 key

# I asignificantamountof so 3 g

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Unformatted text preview: K? 1. The entropy is unaffected by polarity 2. The entropy of the system increases with increasing polarity 3. The entropy of the system decreases with increasing polarity correct The entropy decreases with increasing polarity because some orientations are favored over others. 21. Which of the following compounds would have the highest standard molar entropy at 298 K? 1. CO 2 ( s ) 2. H 2O(l ) 3. Al ( s ) correct 4. H 2O g Water vapor is a gas, which has the highest entropy. 22. Approximate the molar entropy of HCl at 0 K. Assume it has two possible orientations. 1. 5.76 J K 1 2. 0 J K 1 3. 8.31 J K 1 4. 5.76 J K 1 correct S k ln W where W is the number of ways to do something. A 0 K, there are 2 N ways to arrange the HCl molecules. Since we are talking about the molar entropy, N N A and the formula becomes S k ln 2 N A S N A k ln 2 S R ln 2 S 5.76 J K 1 23. Given the following reaction G 142 kJ 2SO 2 ( g ) O 2 ( g ) 2SO 3 ( g ) What can be said with certainty if 2 mol of SO 2 ( g ) is mixed with 1 mol of O 2 ( g ) at room temperature? I. A significant amount of SO 3 ( g ) will be produced eventually II. A significant amount of SO 3 ( g ) will be produced rapidly III. Very little SO 3 ( g ) will be produced on the long time scale 1. I only correct 2. II only 3. III only 4. I and II only 5. II and III only 6. I and III only 7. I,II, and III 8. None of the above If G is negative, then the reaction will happen to a large extent. This makes statement I true and statement III false. However, the sign on G says nothing about the rate at which the reaction happens. Thus, only statement I is true with certainty. 24. The collective exhale from Auburn, Alabama at the end of the college football game released 3.0 10 8 J of heat into the surroundings. What is the increase in the entropy of the surroundings due to this exhale? Assume that the temperature was around 300 K. 1. 1 10 6 J K 1 2. 1 10 6 J K 1 3. 1 10 6 J K 1 correct 6 1 4. 1 10 J K 5. 1 10 9 J K 1 6. 1 10 9 J K 1 Ssurr H sys Tsurr 3.0 10 8 J 300 K 1 10 6 J K 1 Ssurr Ssurr 25. Given the following information H f kJ mol 1 Substance J mol 1...
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