quiz 6 - Version 189 – Quiz 5 – Laude –(53590 1 This...

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Unformatted text preview: Version 189 – Quiz 5 – Laude – (53590) 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 reaction 2 NOCl(g) → 2 NO(g) + Cl 2 (g) with rate constant 0.0480 M − 1 · s − 1 when con- ducted at 200 ◦ C. The initial concentration of NOCl was 0.521 M. What is the concentration of NOCl after 0.535 minutes and at 200 ◦ C? 1. 0.200 M correct 2. 0.112 M 3. 0.289 M 4. 0.0239 M 5. 0.508 M Explanation: k = 0 . 0480 M − 1 · s − 1 t = 0 . 535 min [A] = 0.521 M The units on k indicates a second order reaction: 1 [A] t- 1 [A] = a k t 1 [A] t = 1 [A] + a k t = 1 . 521 M +2(0 . 0480 M − 1 · s − 1 ) × (0 . 535 min) × 60 . 0 s min = 5 . 00 M − 1 [A] t = 0 . 200 M 002 10.0 points A hypothetical reaction A + 2 B → C + D is found to be first order in A and second order in B. What are the units of k , the specific rate constant, if reaction rate is expressed in units of M/s? 1. M − 1 · s 2. M · s − 1 3. M 2 · s − 1 4. M − 2 · s − 1 correct 5. M − 3 · s Explanation: 003 10.0 points10....
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quiz 6 - Version 189 – Quiz 5 – Laude –(53590 1 This...

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