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If bromine atom is available in the form of, say, two isotopes... - Science
Question
If bromine atom is available in the form of, say, two isotopes ^{79}_{35}\text{Br} (49.7%) and ^{81}_{35}\text{Br} (50.3%), calculate the average atomic mass of bromine atom.
Answer
The average atomic mass of bromine is calculated by taking the weighted average of the masses of its isotopes based on their percentage abundance.
Average Atomic Mass = (79 \times \frac{49.7}{100}) + (81 \times \frac{50.3}{100})
= (79 \times 0.497) + (81 \times 0.503)= 39.263 + 40.743= 80.006
Average atomic mass of bromine \approx 80.0 u