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CHM 132 - Exam 2 - 2005

CHM 132 - Exam 2 - 2005 - Chemistry 132 Hour Examination 2...

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Chemistry 132 Hour Examination 2 March 17, 2005 Name ( PRINT)____________________________ Student number____________________________ Workshop Leader__________________________ 1. (35 points ) ____________________ 2. (30 points ) ____________________ 3. (35 points ) ____________________ 4. (30 points ) ____________________ Extra Credit ____________________ TOTAL (130 points ) Show your work neatly and circle your answers. Give correct units for answers requiring them. The last page of the exam gives constants, formulas, and a table of reduction potentials
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Name________________________ 2 1. (35 points) Joe Blow was working in the Chemistry stockroom. He inadvertently placed a gallon jug of hydrochloric acid (HCl) in the same cabinet with aqueous ammonia (NH 4 OH). The next morning, he looked in the cabinet and found a white solid covering every surface. He realized that this solid was NH 4 Cl, and decided to learn about the thermochemistry of the mess he had created. He speculated that the solid was formed by the following reaction: HCl (g) + NH 3 (g) NH 4 Cl (s) Substance H f ° ° (kJ mol -1 ) S ° (J K -1 mol -1 ) HCl ( g) -92.3 186.9 NH 3 (g) -45.9 192.8 NH 4 Cl (s) -314.6 94.9 a) (6 points) Calculate H ° and S ° for the reaction What can you say about the relative bond strengths of reactants and products? b) (4 points) Calculate G ° at 298 K c) (6 points) Calculate K eq at T = 298 K.
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Name________________________ 3 1. (continued) d) (7 points) Calculate the enthalpic contribution to K eq at T = 298 K. Rationalize (a few words) the magnitude of this term. e) (7 points) Calculate the entropic contribution to K eq at T = 298 K. Rationalize (a few words) the magnitude of this term.
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