Exam 4 Key 2006

Exam 4 Key 2006 - DR. JOSEPH BURNETT FALL 2006 THIS EXAM...

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DR. JOSEPH BURNETT FALL 2006 THIS EXAM CONSISTS OF 18 QUESTIONS ON 9 PAGES CHEM 155 HOUR EXAM IV NOVEMBER 29, 2006 NAME______________________ RECIT. INSTR.______________ RECIT. SECT._______________ GRADING Teaching Assistants and Recitation Sections PAGE POINTS SCORE Name Sections Time 2 3 4 5 6 7 8 TOTAL 14 pts 22 pts 22 pts 15 pts 10 pts 21 pts 2 pts 106 pts ________ ________ ________ ________ ________ ________ ________ Gulden Camci Unal Deepak Dibya Kristopher McKee Alex Reynolds Qin Zhao 1, 5, 10, 16 6, 7, 9, 15 2, 11, 12, 14 13 3, 4, 8, 17 8:00, 12:10, 11:00, 10:00 12:10, 1:10, 10:00, 3:10 9:00, 12:10, 1:10, 2:10 2:10 10:00, 11:00, 9:00, 3:10 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 THE CHEM 155 WEBSITE. SHOW ALL WORK. ANSWERS SHOULD INCLUDE APPROPRIATE UNITS AND CONTAIN THE CORRECT NUMBER OF SIGNIFICANT FIGURES. CHEM 155 FINAL EXAM TUESDAY, DECEMBER 12 4:30-6:30 P.M. SAME ROOMS AS HOUR EXAMS – NO CHANGE Answer Key
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2 1. Use the following reaction equation and information to answer parts i and ii. 3 Fe (s) + 4 CO 2 (g) Fe 3 O 4 (s) + 4 CO (g) Δ H = +12.5 kJ i. (2 pts) The reaction is ____________ . A. exothermic B. endothermic C, not enough information to determine. ii. (4 pts) What is the amount of heat in kJ that is transferred by the reaction if 1.98 moles of CO is produced? For full credit, show all work, use units, and report your answer with the correct number of significant figures. 2. (8 pts) Given the following reactions N 2 (g) + O 2 (g) 2 NO (g) Δ H ° = +180.7 kJ 2 NO (g) + O 2 (g) 2 NO 2 (g) Δ H ° = –113.1 kJ calculate the enthalpy of reaction, Δ H rxn , in kJ for: 4 NO (g) 2 NO 2 (g) + N 2 (g) Δ 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) Δ H ° = –180.7 kJ 2 NO (g) + O 2 (g) 2 NO 2 (g) Δ H ° = –113.1 kJ Δ H = –180.7 kJ 113.1 kJ = –293.8 kJ 1.98 mol CO 12.5 kJ 4 mol CO = 6.19 kJ (3 sig figs)
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3 3. (8 pts) Use the information in the table below to determine the enthalpy of reaction ( Δ H o rxn ) for the following reaction. For credit, be neat, use units, show all work, report the correct number of significant figures, and circle your final answer. C 6 H 12 O 6 (s) + 6 O 2 (g) 6 CO 2 (g) + 6 H 2 O ( l ) Substance Δ H o f kJ/mol C 6 H 12 O 6 (s) –1273 C 2 H 5 OH (l) –277.7 C 2 H 4 O 2 (l) –487 H 2 O (l) –285.8 H 2 O (g) –241.8 CO 2 (g) –393.5 4. A. (4 pts) Write the full electron configuration for a ground-state manganese atom (Mn, atomic number 25). 1s
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This note was uploaded on 03/27/2008 for the course CHEM 155 taught by Professor Burnett,joe during the Spring '08 term at Iowa State.

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Exam 4 Key 2006 - DR. JOSEPH BURNETT FALL 2006 THIS EXAM...

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