Quiz 5-solutions

# Quiz 5-solutions - Version 079 – Quiz 5 – Laude –...

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Unformatted text preview: Version 079 – Quiz 5 – Laude – (52390) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 5.0 points Consider the reaction: H 2 CO 3 ( aq )-→ CO 2 ( aq ) + H 2 O( ℓ ) If it has a half-life of 1 . 6 s , how long will it take a system with an initial [H 2 CO 3 ] of 1 M to reach a [H 2 CO 3 ] of 125 mM? 1. 3 . 2 s 2. . 4 s 3. . 8 s 4. not enough information 5. 6 . 4 s correct Explanation: 1 · . 5 x = 0 . 125 M x = 4 half lives 4 · 1 . 6 s = 6 . 4 s 002 5.0 points Consider the elementary reaction: CH 2 O( g ) + O 2 ( g )-→ CO 2 ( g ) + H 2 O( g ) If k = 5 . 4 × 10 4 M- 1 · s- 1 , and there is ini- tially 1 . 334 M O 2 , how long will it take for the O 2 concentration to reach 0 . 443 M ? 1. 17 μ s 2. 20 μ s 3. 28 μ s correct 4. 16 μ s Explanation: 1 [O 2 ] = 1 [O 2 ] + kt 1 . 443 = 1 1 . 334 + ( 5 . 4 × 10 4 ) t t = 0 . 00002792 s 003 5.0 points Express the rate of the following reaction in...
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## This note was uploaded on 05/04/2009 for the course CH 52390 taught by Professor Laude during the Spring '09 term at Adams State University.

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Quiz 5-solutions - Version 079 – Quiz 5 – Laude –...

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