mid 3 - 1 1. Which of the following is necessary for a...

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1 1. Which of the following is necessary for a process to spontaneous? a. Δ sys < 0 b. Δ sys > 0 c. Δ surr > 0 ----> d. Δ univ > 0 e. Δ sys > 0 2. Which of the following pairs has the member with the greater standard molar entropy (S°) listed first ? a. CO (g), CO 2 (g) b. H 2 (g), H 2 O (g) ----> c. H 2 S (g), H 2 S (aq) d. Li (s), Pb (s) e. NaCl (s), NaCl (aq) 3. Given: Pb (s) + Cl 2 (g) < == > PbCl 2 (s) . Δ S° for this reaction is: ----> a. < 0 b. 0 c. > 0 d. Δ H°/ Τ e. there is not enough information given to know with certainty 4. If a certain process is endothermic and the entropy is increasing (i.e. Δ S° is positive), then the process is spontaneous: a. only at a temperature higher than room temperature (298.15 K) ----> b. only at a temperature higher than Δ H°/ Δ c. only at a temperature lower than room temperature (298.15 K) d. only at a temperature lower than Δ H°/ Δ e. at any temperature
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2 5. Given: BCl 3 (g) + 3/2 H 2 (g) < == > B (s) + 3 HCl (g) Δ S° = + 80.3 J/K. If S° for H 2 (g) = 130.6 J/mol K, S° for B (s) = 5.87 J/mol K, and S° for HCl (g) = 186.8 J/mol K, then what is S° for BCl 3 (g)? a. - 18.2 J/mol K b. 18.2 J/mol K ----> c. 290.1 J/mol K d. 355.4 J/mol K e. 450.6 J/mol K 6. Given: 2 Cl 2 (g) + SO 2 (g) < == > SOCl 2 (g) + Cl 2 O (g) Δ S° = - 118.2 J/K. If Δ H f ° for SO 2 (g) = - 296.8 kJ/mol, Δ H f ° for SOCl 2 (g) = - 212.5 kJ/mol, and Δ H f ° for Cl 2 O (g) = + 80.3 kJ/mol, then what is Δ G° for this reaction at 25.0 °C? a.
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This note was uploaded on 10/07/2009 for the course CHEM 1022 taught by Professor Leopold during the Fall '08 term at Minnesota.

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mid 3 - 1 1. Which of the following is necessary for a...

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