chem1bmidterm2

chem1bmidterm2 - Cindy Nguyen W'08 Professor King LARC Chem...

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Cindy Nguyen LARC Chem 1B W’08 Professor King Midterm II Review Questions 1. Arrange the following substances (1 mole each) in order of increasing entropy at 25°C: a) Ne (g), b) SO 2 (g), c) Na (s), d) NaCl (s) 2. Which of the following results in an increase of entropy for the system? Circle any correct answer(s). a. I 2 (g) I 2 (g) b. H 2 O(l) H 2 O(g) c. CH 3 OH(g) + 3/2 O 2 (g) CO 2 (g) + 2H 2 O(l) d. 2O 2 (g) + 2SO 2 (g) 2SO 3 (g) e. KCl(s) K + (aq) + Cl - (aq) 3. Which is more stable at 25°C, O 2 (ΔH° f = 0 kJ/mole) or O 3 (ΔH° f = 142.2 kJ/mole)? 4. Calculate ΔH° rxn for the overall reaction: 2N 2 (g) + 5O 2 (g) 2N 2 O 5 (g) Given information: H 2 (g) + ½ O 2 (g) H 2 O (l) ΔH° = -286 kJ N 2 O 5 (g) + H 2 O (l) 2HNO 3 (g) ΔH° = -77 kJ ½ N 2 (g) + 3/2 O 2 (g) + ½ H 2 (g) HNO 3 (g) ΔH° = -174 kJ 5. Barium (Ba) has a body-centered-cubic unit cell and a density of 3.63 g/cm 3 . What is the atomic radius of barium? (MM Ba: 137.33 g/mole)
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chem1bmidterm2 - Cindy Nguyen W'08 Professor King LARC Chem...

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