Question

Bromine consists of two major isotopes with the following percent abundances and atomic masses: 79Br (50.54% and 78.918 amu) and 81Br (49.46% and 80.916 amu). Calculate the average atomic mass of bromine.
(78.918*0.5054) + (80.916*0.4946) = x
Solve for x.
78.918

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