177Exam3KeyS06

177Exam3KeyS06 - SEAT NO.__________ DR. JOE BURNETT SPRING...

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Unformatted text preview: SEAT NO.__________ DR. JOE BURNETT SPRING 2006 THIS EXAM CONSISTS OF 16 QUESTIONS ON 8 PAGES CHEM 177 EXAM III April 3, 2006 NAME______________________ RECIT. INSTR.______________ RECIT. SECT._______________ GRADING Teaching Assistants and Recitation Sections PAGE POINTS SCORE Name Sections Time 2 3 4 5 6 7 TOTAL 16 pts 24 pts 12 pts 20 pts 20 pts 8 pts 100 pts ________ ________ ________ ________ ________ ________ ________ Bose, Sayantan Delaney, Liz Deo, Archana Jadin, Tamela Jing, Dapeng Schiltz, Holly 9, 11 4, 6 3, 5 10 7, 8 2 12:10, 2:20 9:00, 11:00 9:00, 10:00 1:10 11:00, 12:10 8:00 QUESTIONS ARE WRITTEN ON BOTH SIDES OF EACH PAGE. THERE IS A PERIODIC TABLE ON THE LAST PAGE. YOU MAY REMOVE THIS PAGE FOR SCRATCH PAPER. THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #5 IN THE HALLWAY EAST OF ROOM 1002 GILMAN AND ON THE CHEM 177 WEBSITE. SHOW ALL WORK. ANSWERS SHOULD INCLUDE APPROPRIATE UNITS AND CONTAIN THE CORRECT NUMBER OF SIGNIFICANT FIGURES. CHEM 177 FINAL EXAM THURSDAY, MAY 4 12:00-2:00 P.M. SAME ROOMS AS HOUR EXAMS NO CHANGE Answer Key 2 1. (4 pts) Given: N 2 (g) + O 2 (g) 2 NO (g) H = +180.7 kJ Which one of the following statements is true ? A. The reaction generates heat. B. The reaction is exothermic. C. The products are more stable than are the reactants. D. The reaction is endothermic. E. The reaction is extremely fast. 2. (12 pts) Given the following reactions N 2 (g) + O 2 (g) 2 NO (g) H = +180.7 kJ 2 NO (g) + O 2 (g) 2 NO 2 (g) H = 113.1 kJ calculate the enthalpy of reaction, H rxn , in kJ for: 4 NO (g) 2 NO 2 (g) + N 2 (g) H = kJ For credit, show all work, include units. A. +67.6 B. +45.5 C. 293.8 D. 45.5 E. +293.8 F. None of the above 2 NO (g) N 2 (g) + O 2 (g) H = 180.7 kJ 2 NO (g) + O 2 (g) 2 NO 2 (g) H = 113.1 kJ H = 180.7 kJ 113.1 kJ = 293.8 kJ 3 3. (10 pts) Given the data in the table below and H rxn for the reaction SO 2 Cl 2 (g) + 2 H 2 O ( l ) H 2 SO 4 ( l ) + 2 HCl (g) H = 62kJ Calculate the H f for HCl (g) in kJ. For credit, show all work, include units. A. 184 B. +60 C. 92 D. +30 E. 46 F. None of the above H rxn = i H f products) j H f (reactants) H rxn = H f (H 2 SO 4 ( l ) ) + 2 H f (HCl (g) ) H f (SO 2 Cl 2 (g )) 2 H f (H 2 O ( l )) 2 H f (HCl (g) ) = H rxn [ H f (H 2 SO 4 ( l ) ) H f (SO 2 Cl 2 (g )) 2 H...
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177Exam3KeyS06 - SEAT NO.__________ DR. JOE BURNETT SPRING...

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