Question: Halogenated compounds arc particularly easy to identify by their mass spectra because both chlorine and bromine occur naturally as mixtures of two abundant isotopes. Chlorine

Halogenated compounds arc particularly easy to identify by their mass spectra because both chlorine and bromine occur naturally as mixtures of two abundant isotopes. Chlorine occurs as 35C1 (75.8%) and 37C1 (24.2%); bromine occurs as 79Br (50.7%) and 81Br (49.3%). At what masses do the molecular ions occur for the following formulas? What arc the relative percentages of each molecular ion?

(a) Bromomethane, CH3Br

(b) 1-Chlorohexane, C6H13C1

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