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If bromine atom is available in the form of, say, two isotopes 35Br79 (49.7%) and 35Br81 (50.3%), calculate the average atomic mass of Bromine atom.


Answer :

The atomic masses of two isotopic atoms are 35Br79 is 49.7% and 35Br81 is 50.3%.

Thus, total mass = {(79 x 49.7) / 100} + {(81 x 50.3) / 100} = 39.263 + 40.743 = 80.006 u

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