Radiopaque imaging agents are substances administered either orally or intrave- nously that absorb X-rays more strongly than body material. One of the best known of these is barium sulfate, the key ingredient in the so-called barium cocktail for imaging of the gastrointestinal tract. Among other X-ray contrast media are the so- called triiodoaromatics. You can get some idea of the imaging for which they are used from the following selection of trade names: Angiografin, Gastrografin, Cardiografin, Cholegrafin, Renografin, and Urografin. Following is a synthesis for diatrizoic acid from benzoic acid. СООН COOH COOH NO2 (3) NO2 O,N COOH COOH СООН I ICI 4 NH2 H,N NH2 H,N 'N' `N' I I H H Diatrizoic acid

Radiopaque imaging agents are substances administered either orally or intrave- nously that absorb X-rays more strongly than body material. One of the best known of these is barium sulfate, the key ingredient in the so-called barium cocktail for imaging of the gastrointestinal tract. Among other X-ray contrast media are the so- called triiodoaromatics. You can get some idea of the imaging for which they are used from the following selection of trade names: Angiografin, Gastrografin, Cardiografin, Cholegrafin, Renografin, and Urografin. Following is a synthesis for diatrizoic acid from benzoic acid. СООН COOH COOH NO2 (3) NO2 O,N COOH COOH СООН I ICI 4 NH2 H,N NH2 H,N 'N' `N' I I H H Diatrizoic acid

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter16: An Introduction To Infrared Spectrometry

Section: Chapter Questions

Problem 16.16QAP

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A certain mixture of gasoline obtained from a petroleum refinery plant was found to contain only isooctane (C8H18; FM = 114.22), methyl tert-butyl ether (C5H12O; FM = 88.15), and tetraethyl lead (C8H20Pb; FM = 323.4), a gasoline preservative. Upon complete combustion of 0.4582 g sample, it was found out that the mass of the CO2 (FM = 44.01) absorbent increases by 1.0702 g, while the mass of residue PbO (FM = 223.2) was determined to be 0.0964 g. From this data, calculate the following: a. % (w/w) C8H18b. % (w/w) C5H12Oc. % (w/w) C8H20Pbd. % (w/w) Pb (FM = 207.2) Answer Letter D only
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