Key_final_s04 - Practice Final Exam for Spring 2006 CHE 132 General Chemistry II Stony Brook University 1 When gasoline burns in the piston of an

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Unformatted text preview: Practice Final Exam for Spring, 2006 CHE 132 General Chemistry II Stony Brook University 1. When gasoline burns in the piston of an automobile engine, energy is transferred from the piston (the system) to the engine (the surroundings). Which one of the following is a state function in this process? a) The work done by the system on the surroundings (w sys ). b) The heat transferred to the engine (q engine ). c) The change in energy of the system ( Δ E sys ). d) The change in temperature of the engine ( Δ T). e) None of the above. 2. The boiling point of water is 100°C. Calculate S° H2O (g), the molar entropy of water gas, given Δ H vaporization = 40.79 kJ mol-1 and S° H2O (l) = 69.95 J mol-1 K-1 . a) 40790 kJ mol-1 b) 69.95 J mol-1 K-1 c) 407.9 J mol-1 K-1 d) 179.25 J mol-1 K-1 e) 109.3 J mol-1 K-1 3. A solution of acetic acid in water is described by the following equilibrium: CH 3 COOH(aq) + H 2 O(l) CH 3 COO- + H 3 O + Given that the equilibrium constant (K a ) for this acid-base reaction is 2.0 x 10-5 , calculate the pH of a solution that contains 0.1 M CH 3 COOH and 0.1 M CH 3 COO- at equilibrium. a) 4.7 b) 0.1 c) 7.0 d) 9.3 e) 11.1 4. The reaction of NO(g) and O 2 (g) to form NO 2 has an equilibrium constant (K eq ) of 4.2 x 10 12 . If the initial concentration of NO(g) is 14 atm and the initial concentration of O 2 (g) is 10 atm, calculate the concentration of NO(g) at equilibrium. a) 3 atm b) 1.55 x 10-11 atm c) 3.94 x 10-6 atm d) 65.33 atm e) 4 atm 1 5. The reaction of a substance A is monitored as a function of time. The concentration of a substance A at various times after initiating the reaction is determined and these data are plotted as shown below. Which one of the following statements is not correct? a) The reaction is first order in A. b) The reaction is second order in A. c) t 1/2 for the reaction can be calculated without knowing the initial concentration of A. d) If the initial concentration of A is doubled, the rate of the reaction will double. e) The concentration of A decreases during the reaction. 6. The amino group of the alkaloid atropine has a pK b of 4.1. Calculate the concentration of the conjugate acid form of atropine (R 3 NH + ) at equilibrium given that the initial concentration of atropine (R 3 N) is 0.1 M. Assume that the amount of R 3 NH + at equilibrium is small compared to 0.1 M. R 3 N + H 2 O R 3 NH + + OH- a) 1.26 x 10-10 M b) 8.91 x 10-3 M c) 7.94 x 10-6 M d) 0.1 M e) 2.82 x 10-3 M 2 7. The Haber reaction involves the reaction of N 2 (g) and H 2 (g) to form NH 3 (g). Calculate Δ G ° for the reaction, given that the equilibrium constant at 298 K is 5.6 x 10 5 ....
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This note was uploaded on 09/10/2008 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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Key_final_s04 - Practice Final Exam for Spring 2006 CHE 132 General Chemistry II Stony Brook University 1 When gasoline burns in the piston of an

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