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 Size157.8360.2569159.8340.4999161.8320.2431Calculate the abundance of the lighter isotope.

FREE Expert Solution

79Br81Br : mass = 159.834 amu

79Br79Br: mass = 157.836 amu

81Br81Br: mass = 161.832 amu


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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


Calculate the abundance of the lighter isotope.

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