# 12 - Elbel, Brittany Homework 12 Due: Apr 28 2006, noon...

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Elbel, Brittany – Homework 12 – Due: Apr 28 2006, noon – Inst: J A Holcombe 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. The due time is Central time. 001 (part 1 oF 1) 10 points The rate oF Formation oF NO 2 (g) in the reac- tion 2 N 2 O 5 (g) 4 NO 2 (g) + O 2 (g) is 5 . 78 (mol NO 2 ) / L / s. What is the rate at which N 2 O 5 decom- poses? 1. 5 . 78 (mol N 2 O 5 ) / L / s 2. 1 . 45 (mol N 2 O 5 ) / L / s 3. 0 . 723 (mol N 2 O 5 ) / L / s 4. 11 . 6 (mol N 2 O 5 ) / L / s 5. 2 . 89 (mol N 2 O 5 ) / L / s correct Explanation: 002 (part 1 oF 1) 10 points Consider the reaction 2 NO 2 (g) + ± 2 (g) 2 NO 2 ±(g) rate = - Δ[± 2 ] Δ t . What is another Form oF the rate oF the reaction? 1. Δ[NO 2 ] 2 Δ t 2. - 2 Δ[NO 2 ] Δ t 3. Δ[NO 2 ±] 2 Δ t correct 4. - Δ[NO 2 ] Δ t 5. Δ[NO 2 ±] Δ t Explanation: 003 (part 1 oF 1) 10 points IF the average rate oF decomposition oF PH 3 (g) is 3 . 2 (mol PH 3 ) / L / min For the reaction 2 PH 3 (g) 2 P(g) + 3 H 2 (g) , what is the unique average reaction rate? 1. 4 . 8 mol / L / min 2. 3 . 2 mol / L / min 3. 6 . 4 mol / L / min 4. 2 . 1 mol / L / min 5. 1 . 6 mol / L / min correct Explanation: 004 (part 1 oF 1) 10 points IF the rate oF reaction increases by a Factor oF 9.6 when the concentration oF reactant in- creases by a Factor oF 3.1, what is the order oF the reaction with respect to this reactant? 1. 4 2. 3 3. 1.5 4. 2 correct 5. 1 Explanation: 005 (part 1 oF 1) 10 points ±or the reaction 2 NO(g) + 2 H 2 (g) N 2 (g) + 2 H 2 O(g) the Following data were collected. [NO(g)] [H 2 (g)] Rate, M/s 0.10 0.10 0.0050 0.10 0.20 0.010 0.10 0.30 0.015 0.20 0.10 0.020 0.20 0.20 0.040

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Elbel, Brittany – Homework 12 – Due: Apr 28 2006, noon – Inst: J A Holcombe 2 What is the rate law for this reaction? 1. rate = k [H 2 ] [NO] 2. rate = k [H 2 ] [NO] 2 3. rate = k [H 2 ] [NO] 2 correct 4. None of these 5. rate = k [H 2 ] [NO] 6. rate = k [H 2 ] 2 [NO] Explanation: 006 (part 1 of 1) 10 points For a ±rst-order reaction, after 230 s, 33% of the reactants remain. Calculate the rate constant for the reaction. 1. 0.00174 s - 1 2. 0.00209 s - 1 3. 0.00482 s - 1 correct 4. 0.000756 s - 1 5. 207 s - 1 Explanation: 007 (part 1 of 1) 10 points The reaction 2 ClO 2 (g) + F 2 (g) 2 FClO 2 (g) is ±rst-order in both ClO 2 and F 2 . When the initial concentrations of ClO 2 and F 2 are equal, the rate after 25% of the F 2 has reacted is what percent of the initial rate? 1. 75.0% 2. 18.8% 3. 37.5% correct 4. 12.5% 5. 28.1% Explanation: 008 (part 1 of 3) 10 points A particular reaction is found to have the rate law R = k [A] [B] 2 How is the rate a²ected a) if the initial concentration of A is cut in half? 1.
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## This note was uploaded on 06/23/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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12 - Elbel, Brittany Homework 12 Due: Apr 28 2006, noon...

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