Homework 1 - CHEMISTRY 201X Homework#1"Isotopes and Mass...

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CHEMISTRY 201X: Homework #1 Due : Thursday, August 30, 2007 “Isotopes and Mass Spectrometry” (1) (16 Pts) (a) (8 pts) Determine the accurate molecular masses (in amu) and percent abundances of all naturally occurring molecular isotopes of chloroform, CHCl 3 . (A source of useful information is the CRC Handbook of Chemistry and Physics , 87 th Edition.) (b) (4 pts) Consider that a sample of chloroform is studied by a low-resolution mass spectrometer, which cannot distinguish mass differences smaller than 0.1 amu. Predict the mass spectrum of chloroform near its molecular weight peak in this spectrometer. (c) (4 pts) Consider that a sample of chloroform is studied by a different low-resolution mass spectrometer, which cannot observe molecules whose relative abundance is less than 0.01%. Predict the mass spectrum of chloroform near its molecular weight peak in this spectrometer. (2) (20 Pts) A high resolution mass spectrometer is needed to establish precise atomic masses.
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