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May 26, 2015

Homework Help: chemistry

Posted by susan on Friday, May 6, 2011 at 9:47am.

90.92% of the atoms have a mass of 19.988 u, 0.26% of the atoms have a mass of 20.983 u and 8.82% of atoms have a mass of 21.978 u. Calculate the average atomic mass of this element

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