quiz5dvb - Version 206 Quiz 5 VANDEN BOUT (53585) 1 This...

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Unformatted text preview: Version 206 Quiz 5 VANDEN BOUT (53585) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Consider the irreversible reaction A + 2 B 3 C . Which of the following correctly expresses the rate of change of [B] ? 1. [B] t =- 1 2 (rate of rxn) 2. [B] t =- 2 (rate of rxn) correct 3. [B] t = +(rate of rxn) 4. [B] t =- (rate of rxn) 5. [B] t = +2 (rate of rxn) 6. [B] t = + 1 2 (rate of rxn) Explanation: As B is a reactant and consequently disap- pears during the reaction, its rate of change will be negative and the inverse of the coeffi- cient is used when writing the rate: (rate of rxn) =- 1 2 [B] t- 2 (rate of rxn) = [B] t 002 10.0 points The reaction 2 N 2 O 5 2 N 2 O 4 + O 2 is first order. At a certain temperature it has a rate constant of 0.0840 sec 1 . At this temperature, how long would it take for 95% of a given sample to decompose?of a given sample to decompose?...
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This test prep was uploaded on 04/12/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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quiz5dvb - Version 206 Quiz 5 VANDEN BOUT (53585) 1 This...

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