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5. An unknown element is found with the following isotopid percent abundance: X-20 is found at an abundance of 90.50%, X-21 is found at an abundance of 27% and X-22 is found at an abundance of 9.23%. Given this information find the average atomic mass of the elementi show your work for full credit :

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5. An unknown element is found with the following isotopid percent abundance: X-20 is found at an ab...

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