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By solving this problem student understand about isotopic abundance and how to find out atomic weight (average atomic mass) of an element.

Only two isotopes of copper occur naturally, 63Cu (atomic mass = 62.9296 amu;abundance 69.17% ) and 65Cu (atomic mass = 64.9278 amu; abundance 30.83% ).find out the atomic weight (average atomic mass) of copper.

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