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8 April, 14:07

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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  1. 8 April, 16:11
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    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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