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The average atomic mass of an element is the weighted average of the masses of its isotopes, taking into account their natural abundances. To calculate the average atomic mass of bromine, we need to determine the masses of its isotopes and their relative abundances.
The two isotopes of bromine are Br-79 and Br-81. The mass of Br-79 is 78.918 amu, while the mass of Br-81 is 80.916 amu. The natural abundance of Br-79 is 50.69%, while the natural abundance of Br-81 is 49.31%.
Bromine Atomic Mass
To calculate the average atomic mass of bromine, we multiply the mass of each isotope by its natural abundance, and then add the results:
(mass of Br-79) x (natural abundance of Br-79) + (mass of Br-81) x (natural abundance of Br-81)
= (78.918 amu) x (0.5069) + (80.916 amu) x (0.4931) = 39.9129 amu + 39.9253 amu
= 79.8382 amu
Therefore, the average atomic mass of bromine is 79.8382 amu.
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