How to calculate the abundance

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the hypothetical metal Q with atomic mass of 68.33 has two isotopes ^67Q (isotopic mass 66.945 amu) and ^69Q (isotpes mass 68.958 amu) calculate the abundance of ^67Q in %

1) 31.2 %
2) 68.8%
3) 25.0%
4) 77.8%
5) 22.2 %

Reference no: EM13184132

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