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15 September, 04:45

Calculate the atomic mass for copper using the weighted average mass method. Express your answer using two decimal places and include the appropriate units.

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  1. 15 September, 05:02
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    63. 55 amu

    Explanation:

    Copper is known to exist in two different isotopes which are Cu-63 and Cu-65.

    Cu-63 has an atomic mass of 62.93 amu and it has an abundance of 69.15%.

    Similarly,

    Cu-65 has an atomic mass of 64.93 amu and it has an abundance of 30.85%

    Therefore, using the weighted average mass method, the atomic mass of copper is:

    Atomic mass of copper = (0.6915*62.93) amu + (0.3085*64.93) amu = 43.52 amu + 20.03 amu = 63.55 amu

    Thus, the atomic mass of copper (express in two decimal places) is 63.55 amu
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