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Quiz 6-solutions

# Quiz 6-solutions - Version 180 Quiz 6 laude(51635 This...

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Version 180 – Quiz 6 – laude – (51635) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 5.0 points Consider the elementary reaction: CH 2 O( g ) + O 2 ( g ) -→ CO 2 ( g ) + H 2 O( g ) IF k = 2 . 25 × 10 3 M - 1 · s - 1 , and there is ini- tially 4 M O 2 , how long will it take For the O 2 concentration to reach 0 . 4 M ? 1. 10 ms 2. 9 ms 3. 1 ms correct 4. 10 μ s 5. 90 μ s Explanation: 1 [O 2 ] = 1 [O 2 ] 0 + kt 1 0 . 4 = 1 4 + ( 2 . 25 × 10 3 ) t t = 0 . 001 s 002 5.0 points Consider the rate constants below. Which would correspond to the highest order reac- tion? 1. k = 4 . 46 × 10 - 1 M - 1 · s - 1 2. k = 8 . 79 × 10 2 M · s - 1 3. k = 2 . 35 × 10 6 s - 1 4. k = 1 . 88 × 10 - 3 M - 2 · s - 1 correct Explanation: Units oF M - 2 · s - 1 would correspond to a 3 rd order reaction. 003 5.0 points Consider the reaction mechanism below: Step Reaction 1 CH 3 Br CH 3 + + Br - 2 CH 3 + + HCl CH 3 Cl + H + 3 H + + Br - HBr overall CH 3 Br + HCl CH 3 Cl + HBr IF the rate law is experimentally determined to be rate = k · [CH 3 Br] · [HCl] · [Br - ] - 1 , what is the rate-limiting step?

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Quiz 6-solutions - Version 180 Quiz 6 laude(51635 This...

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