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The abundance of three isotopes of oxyge...

The abundance of three isotopes of oxygen are as follows :
% of `O^(16) = 90%`
% of `O^(17) + %` of `O^(18) = 10 %`
Assume at. Mass same as mass no. find `%` of `O^(17)`, if the isotopic mass is 16.12

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