hw9a - Thomas, Phillip Homework 9 Due: Nov 28 2007, 11:00...

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Unformatted text preview: Thomas, Phillip Homework 9 Due: Nov 28 2007, 11:00 pm Inst: Brodbelt 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. Brodbelt CH301 HW 9 Due November 28, 11:00 pm 001 (part 1 of 1) 10 points A B Reaction progress Energy(kJ) 250 300 350 Graph I A B Reaction progress Energy(kJ) 250 300 350 Graph II Which graph corresponds to an exothermic process? 1. Neither Graph I nor Graph II 2. Both Graph I and Graph II 3. Cannot be determined with the informa- tion given 4. Graph I 5. Graph II correct Explanation: 002 (part 1 of 1) 10 points The best definition of heat is 1. temperature. 2. the transfer of energy. correct 3. vibrational energy. 4. potential energy. 5. kinetic energy. Explanation: Heat flows spontaneously from a hotter body to a colder body. 003 (part 1 of 1) 10 points How much heat is required to change the tem- perature of two cups of water (500 mL) from room temperature (25 C) to boiling? 1. 78.5 kJ 2. 1.57 kJ 3. 157 kJ correct 4. 15.7 kJ 5. 0.785 kJ 6. 7.85 kJ Explanation: q = m specific heat T. water = 1 g/mL so 500 ml = 500 g 004 (part 1 of 1) 10 points In the manufacture of nitric acid by the oxi- dation of ammonia, the first product is nitric oxide. The nitric oxide is then oxidized to nitrogen dioxide: 2NO(g) + O 2 (g)- 2NO 2 (g) Calculate the standard reaction enthalpy for the reaction above (as written) using the following data: N 2 (g) + O 2 (g)- 2NO(g) H = 180 . 5 kJ N 2 (g) + 2O 2 (g)- 2NO 2 (g) H = 66 . 4 kJ 1.- 128 . 2 kJ/mol rxn Thomas, Phillip Homework 9 Due: Nov 28 2007, 11:00 pm Inst: Brodbelt 2 2.- 690 . 72 kJ/mol rxn 3.- 520 . 2 kJ/mol rxn 4.- 114 . 1 kJ/mol rxn correct 5.- 100 . 3 kJ/mol rxn 6.- 975 . 0 kJ/mol rxn 7.- 252 . 4 kJ/mol rxn Explanation: Using Hess Law and the given standard re- action enthalpies, the first reaction is reversed and added to the second: 2NO(g)- N 2 (g) + O 2 (g) H =- 180 . 5 kJ N 2 (g) + 2O 2 (g)- 2NO 2 (g) H = 66 . 4 kJ 2NO(g) + O 2 (g)- 2NO 2 (g) H =- 114 . 1 kJ 005 (part 1 of 1) 10 points Burning 1 mol of methane in oxygen to form carbon dioxide and water produces 803 kJ of energy. How much energy is produced when 3 mol of methane is burned?...
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hw9a - Thomas, Phillip Homework 9 Due: Nov 28 2007, 11:00...

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