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Disc_Sect_5 - 2 O(l c 6 C(graphite 6 H 2(g 6 O 2(g Æ C 6 H...

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Chemistry 104 B/D Discussion Section Worksheet Discussion Section #5 Key Ideas from Lecture #5: o f H Δ : 2 nd Law of Thermodynamics: Entropy: Let’s think about these concepts for a bit... We have a quiz today…so we’ll do this again next week. Problems: Hour Exam I, Spring 2007, #2 Which of the following involve an increase in the entropy of the system? 1. melting of a solid 2. sublimation 3. freezing 4. mixing 5. boiling 6. separation Stuck? Start by looking at Sample Exercises 16.1 and 16.2 and the proceeding discussion (pgs 754-755 of Zumdahl). Hour Exam I, Fall 2007, #5 Which of the following reactions represent Heat of Formation Reactions ? a. Na + (aq) + Cl - (aq) Æ NaCl (aq) b. 2 H 2 (g) + O 2 (g) Æ 2 H
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Unformatted text preview: 2 O (l) c. 6 C (graphite) + 6 H 2 (g) + 6 O 2 (g) Æ C 6 H 12 O 6 (s) d. Pb (s) + S (s) + 2 O 2 (g) Æ PbSO 4 (s) Stuck? Start by looking at Sample Exercise 6.9 (page 249 of Zumdahl) and the proceeding discussion. Hour Exam I, Fall 2007, #2 Choose the compound of each of the following pairs that has the highest positional entropy: a. 1 mol H 2 (at STP) or b.1 mol H 2 (at 100 o C, 0.5 atm) c. 1 mol N 2 (at STP) or d. 1 mol N 2 (at 100 K, 2.0 atm) e. 1 mol H 2 O (s) (at 0 o C) or f. 1 mol H 2 O (l) (at 20 o C) g. 1 mol H 2 O (l) (at 25 o C) or h. 1 mol H 2 (g) (at STP) Stuck? Start by looking at Sample Exercises 16.1 and 16.2 and the proceeding discussion (pgs 754-755 of Zumdahl). 1...
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