Question

An element 'A' has two isotopes 79 A and 81 A and average atomic mass of a sample of this 3 element 'A' is 80u. Calculate the percentage abundance of isotopes 79A and 81A.
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Answer 1

Answer:

let x be abundance of 79A isotope

79x + 81(1-x) = 80 so 81-2x = 80 so x = 1/2 ie 50%

so both isotopes are present in 50% abundance because 100-50 = 50.

Answer 2

Explanation:

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