CHhmwk9 - moore (jwm2685) Homework 9 vanden bout (51640) 1...

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Unformatted text preview: moore (jwm2685) Homework 9 vanden bout (51640) 1 This print-out should have 38 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points If the average rate of formation of H 2 (g) is 3 . 90 (mol H 2 ) / L / s for the reaction 2 PH 3 (g) 2 P(g) + 3 H 2 (g) , what is the unique average reaction rate? 1. 11 . 7 mol / L / s 2. 3 . 90 mol / L / s 3. 1 . 30 mol / L / s correct 4. 2 . 60 mol / L / s 5. 7 . 80 mol / L / s Explanation: 002 10.0 points Consider the reaction 2 NO 2 (g) + F 2 (g) 2 NO 2 F(g) rate =- [F 2 ] t . What is another form of the rate of the reaction? 1. [NO 2 F] 2 t correct 2. [NO 2 F] t 3.- [NO 2 ] t 4.- 2 [NO 2 ] t 5. [NO 2 ] 2 t Explanation: 003 10.0 points Consider the concentration-time dependence graph for a first-order reaction. [A] Molar Concentration of Reactant A B C Concentration- Time- At which point on the curve is the reaction fastest? 1. A + t 1 / 2 2. C 3. A correct 4. The rates are the same at all points. 5. B Explanation: Steeper portions of the graph define faster reactions. 004 10.0 points Consider the concentration-time dependence as shown below for two first order reactions. [A] Molar Concentration of Reactant Concentration- Time- moore (jwm2685) Homework 9 vanden bout (51640) 2 Which reaction has the greatest t 1 / 2 ? 1. the reaction represented by the upper curve correct 2. Unable to determine 3. the reaction represented by the lower curve Explanation: 005 10.0 points When the reaction 3 NO(g) N 2 O(g) + NO 2 (g) is proceeding under conditions such that 0.015 mol/L of N 2 O is being formed each second, the rate of the overall reaction is ? and the rate of change for NO is ? . 1. 0.015 M s 1 ;- 0.045 M s 1 correct 2. 0.030 M s 1 ;- 0.005 M s 1 3. 0.015 M s 1 ;- 0.005 M s 1 4. 0.015 M s 1 ; +0.045 M s 1 5. none of the other answers is correct Explanation: Notice that three moles of NO are required to make one mole of N 2 O in this reaction, so the rate of disappearance of NO (which has a negative sign) is three times the rate of appearance of N 2 O. 006 10.0 points The overall reaction: 2 O 3 ( g )- 3 O 2 ( g ) has an empirically determined rate law with a single unimolecular event. If k = 4 . 10 5 M 1 s 1 , [O 3 ] = 0.5 M and [O 2 ] = 0.2 M, what is the observed rate? 1. 4 . 10 3 M s 1 2. 2 . 10 5 M s 1 correct 3. 4 . 10 4 M s 1 4. 2 . 10 4 M s 1 Explanation: rate = k [O 3 ] = 4 . 10 5 M 1 s 1 . 5 = 2 . 10 5 M 1 007 10.0 points What is the rate law for the reaction A + B + C D if the following data were collected?...
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This note was uploaded on 05/02/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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CHhmwk9 - moore (jwm2685) Homework 9 vanden bout (51640) 1...

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