The average atomic mass of Bromine is 80.006u .If it occurs as two isotopes Br-81 and Br-79 find the % abundance of each isotope.
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Answers
Answer:
The atomic mass of an element is the mass of one atom of that element. Average atomic mass takes into account the isotopic abundance.
Isotope of bromine with atomic mass 79 u = 49.7%
Therefore, Contribution of 35Br79 to atomic mass = (79 × 49.7)/100
⇒ 39.26 u
Isotope of bromine with atomic mass 81 u = 50.3%
Contribution of 35Br81 to the atomic mass of bromine = (81 × 50.3)/100
⇒ 40.64u
Hence, average atomic mass of the bromine atom = 39.26 + 40.64 u = 79.9u
Answer
The average atomic mass of the bromine atom = 79.9u
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Answer:
Lets say x% of Br - 81 exists.
Then 100 - x % of Br - 79 exists
Now, we can say:
80.006 =
8000.6 = 81x + 7900 - 79x
2x = 100.6
x = 50.3 %
100-x = 49.7%
Therefore Br-81 has 50.3% abundance while Br-79 has 49.7% abundance.
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