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Homework 9 - fernandez(jf23742 Homework 9 Brodbelt(53765...

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fernandez (jf23742) – Homework 9 – Brodbelt – (53765) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. Homework 9: Thermochemistry Due November 26, 2008, at 11:00 PM 001 10.0 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. Graph II 3. Both Graph I and Graph II 4. Graph I 5. Cannot be determined with the informa- tion given 002 10.0 points The best definition of heat is 1. the transfer of energy. 2. potential energy. 3. kinetic energy. 4. vibrational energy. 5. temperature. 003 10.0 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. 157 kJ 2. 7.85 kJ 3. 78.5 kJ 4. 1.57 kJ 5. 15.7 kJ 6. 0.785 kJ 004 10.0 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: 2 NO(g) + O 2 (g) -→ 2 NO 2 (g) Calculate the standard reaction enthalpy for the reaction above (as written) using the following data: N 2 (g) + O 2 (g) -→ 2 NO(g) Δ H = 180 . 5 kJ N 2 (g) + 2 O 2 (g) -→ 2 NO 2 (g) Δ H = 66 . 4 kJ 1. - 100 . 3 kJ/mol rxn 2. - 128 . 2 kJ/mol rxn 3. - 520 . 2 kJ/mol rxn 4. - 690 . 72 kJ/mol rxn 5. - 975 . 0 kJ/mol rxn 6. - 114 . 1 kJ/mol rxn
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fernandez (jf23742) – Homework 9 – Brodbelt – (53765) 2 7. - 252 . 4 kJ/mol rxn 005 10.0 points Burning 1 mol of methane in oxygen to form CO 2 (g) and H 2
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