# hw9a - Thomas Phillip – Homework 9 – Due 11:00 pm –...

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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 × Δ 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) Δ H ◦ = 180 . 5 kJ N 2 (g) + 2O 2 (g)-→ 2NO 2 (g) Δ 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) Δ H ◦ =- 180 . 5 kJ N 2 (g) + 2O 2 (g)-→ 2NO 2 (g) Δ H ◦ = 66 . 4 kJ 2NO(g) + O 2 (g)-→ 2NO 2 (g) Δ 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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## This note was uploaded on 06/07/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Fall '07 term at University of Texas.

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hw9a - Thomas Phillip – Homework 9 – Due 11:00 pm –...

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