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The element copper has two naturally occurring isotopees. One of these has a mass of 62.93...

The element copper has two naturally occurring isotopees. One of these has a mass of 62.93 amu and a natural abundance of 69.09%. A. Second isotope has a mass of 64.9278 amu and a natural abundance of 30.91% . Calculate the atomic mass of copper.

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Answer #1

atomic weight of Cu = natural abundance of 1st isotope x atomic mass of the isotope + natural abundance of 2nd isotope x atomic mass of the isotope

natural abundance of 1st isotope = 0.6909 (expressed as decimal)

natural abundance of 2nd isotope = 0.3091 (expressed as decimal)

atomic weight of Cu = 0.6909 x 62.93 + 0.3091 x 64.9278

                             = 43.478 + 20.069

                             = 63.547

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