Quiz 9 Aspirin-solutions

Quiz 9 Aspirin-solutions - Version 129/ACAAB Quiz 9 Aspirin...

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Unformatted text preview: Version 129/ACAAB Quiz 9 Aspirin lyon (51155) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 1 2 3 4 5 6 7 AA AB AC AD BA BB BC 8 9 10 BACK NEXT BD CA CB CC CD 001 10.0 points What is the chemical name for aspirin? 1. naproxen 2. o-dimethylbenzene 3. ibuprofen 4. acetaminophen 5. acetylsalicylic acid correct Explanation: Aspirin is also called acetylsalicylic acid. 002 10.0 points A 4 . 85 mg/L solution of FeSCN 2+ has a trans- mittance of 0 . 504 when measured in a 1 . 00 cm cuvette at 580 nm. Calculate the molar ab- sorptivitiy at this wavelength. (The molar mass of FeSCN 2+ = 113 . 9 g/mol) 1. 69 M- 1 cm- 1 2. 5 . 90 10 3 M- 1 cm- 1 3. 4 . 01 10 2 M- 1 cm- 1 4. 1 . 07 10 2 M- 1 cm- 1 5. 7 . 00 10 3 M- 1 cm- 1 correct Explanation: A = lc A =- logT =- log . 504 = 0 . 298 l = 1 . 00 cm c = parenleftbigg 4 . 85 10- 3 g FeSCN 2+ L parenrightbigg parenleftbigg 1 mol FeSCN 2+ 113 . 9 g FeSCN 2+ parenrightbigg = 4 . 26 10- 5 M = A lc = . 298 (4...
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This note was uploaded on 12/13/2011 for the course CH 204 taught by Professor Leytner during the Fall '08 term at University of Texas at Austin.

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Quiz 9 Aspirin-solutions - Version 129/ACAAB Quiz 9 Aspirin...

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