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Naturally occurring copper is composed of 69.2% of 63Cu and 30.8% of 65Cu. Atoms of 63Cu have a mass of 62.9296 u and those of 65Cu have a mass of 64.9278 u. Calculate the average atomic mass of copper. Enter your answer with 3 significant digits.

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Answer:

The answer to your question is: 63.5 u

Explanation:

Data                  Percent                         Molecular mass

63 Cu               69.2%                             62.9296 u

65Cu                 30.8%                             64.9278 u

Average atomic mass = ?

Formula

Average atomic mass = (0.692 x 62.9296) + (0.308 x 64.9278)

                                     = 43.55 + 19.99

                                      = 63.5 u

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