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

Answer

To find the percentage of the isotope \( O^{17} \) given the isotopic mass and the abundance of the isotopes, we can follow these steps:

### Step 1: Define the known values
We know:
- The percentage of \( O^{16} \) is \( 90\% \).
- The combined percentage of \( O^{17} \) and \( O^{18} \) is \( 10\% \).
- Let \( x \) be the percentage of \( O^{17} \).
- Therefore, the percentage of \( O^{18} \) will be \( 10 - x \).