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Answer to Question #54695 in General Chemistry for Julia

Question #54695
A sample of naturally occurring silicon consists Si-28 (amu = 27.9769), Si-29 (amu = 28.9765) and Si-30 (amu = 29.9738). If the atomic mass of silicon is 28.0855 and the natural abundance of Si-29 is 4.67%, what are the natural abundances of Si-28 and Si-30?
If you could explain how to solve this it would be greatly appreciated.
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