An element A exist in two isotropic forms A15 and A16 if the average atomic mass of A was found to be 15.24 then then percentage relative abundance of A15 will be
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Explanation:
A15 means an isotope with relative atomic mass = 15
a16 means an isotope with relative atomic mass = 16
Let the percentage abundance of a15 = x%
The percentage abundance of a16 = 100 – x
The average atomic mass of a = [15x + 16(100-x)] / 100 = 15.24
15x + 16(100-x) = 1524
15x + 1600-16x = 1524
-x = -14576
x = 76
The percentage abundance of a15 = 76%
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