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 first (mass of 157.836 amu) peak (of what isotopes does each consist)?

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We’re being asked to determine the origin of first (mass of 157.836 amu) peak (of what isotopes does each consist).

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


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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 first (mass of 157.836 amu) peak (of what isotopes does each consist)?