Halogenated compounds are particularly easy to identify by their mass
spectra because both chlorine and bromine occur naturally as mixtures
of two abundant isotopes. Recall that chlorine occurs as 35Cl (75.8%)
and 37Cl (24.2%); and bromine occurs as 79Br (50.7%) and 81Br (49.3%).
At what masses do the molecular ions occur for the following formulas? What are the relative percentages of each molecular ion?
(a) Bromomethane, CH3Br (b) 1-Chlorohexane, C6H13Cl

Question

28-08-2022
Chemistry

contestada

Halogenated compounds are particularly easy to identify by their mass
spectra because both chlorine and bromine occur naturally as mixtures
of two abundant isotopes. Recall that chlorine occurs as 35Cl (75.8%)
and 37Cl (24.2%); and bromine occurs as 79Br (50.7%) and 81Br (49.3%).
At what masses do the molecular ions occur for the following formulas? What are the relative percentages of each molecular ion?
(a) Bromomethane, CH3Br (b) 1-Chlorohexane, C6H13Cl

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pstnonsonjoku pstnonsonjoku · Answer 1 · 2022-08-31T05:34:52+02:00

The bromomethane would have peaks at m/z = 94 and m/z = 96 corresponding to 79Br and 81Br respectively while the peak for the molecular ion of Chlorohexane can only occur at m/z = 66.

What is the molecular ion?

The molecular ion in a mass spectra refers to the tallest pick in the spectrum. This would always belong to the specie with the highest mass. Let us recall that the mass spectrum could be used to identify the mass of the compound.

We look at the spectrum to understand the tallest mass and this gives us the mass of the compound that is under examination.

Now we can see that the bromomethane would have peaks at m/z = 94 and m/z = 96 corresponding to 79Br and 81Br respectively while the peak for the molecular ion of Chlorohexane can only occur at m/z = 66.

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