Problem: There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br2 molecules, and the mass of a Br2 molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of Br2 consists of three peaks: Mass (amu)  Relative Size157.8360.2569159.8340.4999161.8320.2431What is the origin of third (mass of 161.832 amu) peak (of what isotopes does each consist)?

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We’re being asked to determine the the origin of the third peak (mass = 161.832 amu) given the mass spectrum data of Br2 gas.

Mass Spectrometry allows you to determine the molecular weight of an unknown compound through its vaporization and ionization. 

Mass spectrometer is used to determine the mass to charge ratio of an unknown compound


Given:

 Mass (amu)  Relative Size
157.8360.2569
159.8340.4999
161.8320.2431
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Problem Details
There are two different isotopes of bromine atoms. Under normal conditions, elemental bromine consists of Br2 molecules, and the mass of a Br2 molecule is the sum of the masses of the two atoms in the molecule. The mass spectrum of Br2 consists of three peaks:


 Mass (amu Relative Size
157.8360.2569
159.8340.4999
161.8320.2431


What is the origin of third (mass of 161.832 amu) peak (of what isotopes does each consist)?

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