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Unformatted text preview: hyun (hh7953) Homework 7 Sparks (53435) 1 This print-out should have 17 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. NOTE: Make sure to use the bond energy table that prints with your homework assign- ment, NOT the one in the textbook. The values in the tables differ slightly. Also make sure to see the asterick and corresponding note for the carbon oxygen double bond. You should also try the practice problems available in your course packet: energy cal- culation practice, p. 38, potential energy diagrams, p. 41, and isomer practice, p. 42. Answers are in the back of the packet. 001 10.0 points Methane has a heat of combustion of about 50 kJ/g. About how much heat would be produced if 15 moles of methane were burned? 1. 9,600 kJ 2. over 15,000 kJ 3. 800 kJ 4. 750 kJ 5. 12,000 kJ correct Explanation: H comb = 50 kJ/g n = 15 mol MW methane = 16 g Molar H comb = (- 50 kJ / g)(16 g / mol) = 800 kJ / mol . The amount of heat produced from burning 15 moles is (15 mol)(800 kJ / mol) = 12 , 000 kJ . 002 10.0 points Smokey the cannon is heard after each Longhorn score as two blank 10-gauge shot- gun shells are fired. A possible fuel that could be used to initiate firing is acetylene (C 2 H 2 ) (g). The heat of combustion of C 2 H 2 at 25 C is 310.61 kcal/mol. Given 4 . 4 g of C 2 H 2 (g), calculate the amount of energy given off in the reaction....
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This note was uploaded on 01/19/2010 for the course CH 53435 taught by Professor Sparks during the Fall '09 term at University of Texas at Austin.
- Fall '09