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Q.

The average atomic mass of bromine, containing two isotopes Br3579 with 49.7% and Br3581 with 50.3%  is


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a

60u

b

100u 

c

70u

d

80u

answer is B.

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Detailed Solution

detailed_solution_thumbnail
The average atomic mass of bromine, containing two isotopes, Br3579 with 49.7% and Br3581 with 50.3%,  is 80u.
The average atomic mass of an element is calculated by using the formula
u1×%+u2×%
Therefore, the atomic mass of bromine is
79×49.7100+81×50.3100
⇒79×0.497+81×0.503
⇒39.26+40.74
⇒80u
As a result, the atomic mass of bromine is 80u.
  
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