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Question 10
If bromine atom is available in the form of, say, two isotopes 7935Br (49.7%) and 8135Br(50.3%), calculate the average atomic mass of bromine atom.

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Solution

Isotope of bromine with atomic mass 79 u = 49.7%
Therefore, Contribution of 7935Br to atomic mass =79×49.7100=39.26u
Isotope of bromine with atomic mass 81 u = 50.3%
Contribution of 8135Br to the atomic mass of bromine =81×50.3100=40.74u
Hence atomic mass of the bromine atom =39.26+40.74u=80u


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