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The average atomic mass of bromine, containing two isotopes ${Br}_{35}^{79}$ with 49.7% and ${Br}_{35}^{81}$ with 50.3% is

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60u

100u

70u

80u

answer is B.

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Detailed Solution

The average atomic mass of bromine, containing two isotopes,

{Br}_{35}^{79}

with 49.7% and

{Br}_{35}^{81}

with 50.3%, is 80u.
The average atomic mass of an element is calculated by using the formula

(u_{1} \times % + u_{2} \times %)

Therefore, the atomic mass of bromine is

(79 \times \frac{49.7}{100}) + (81 \times \frac{50.3}{100})

\Rightarrow (79 \times 0.497) + (81 \times 0.503)

\Rightarrow 39.26 + 40.74

\Rightarrow 80 u

As a result, the atomic mass of bromine is 80u.

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