A sample of copper (Cu) contains 69.17% Cu-63. The remaining copper atoms are Cu-65. What is the average atomic mass of copper?

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A sample of copper (Cu) contains 69.17% Cu-63. The remaining copper atoms are Cu-65. What is the average atomic mass of copper?

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Answer 1 · 2017-02-04T20:48:21

$Average atomic mass = 63.62 amu$ $"Average atomic mass = 63.62 amu"$

Explanation:

$Average atomic mass$ $"Average atomic mass"$ is the weighted average of the individual isotopes.

And thus the weighted average $=$ $=$

$(0.6917 \times 63 + 0.3083 \times 65) \cdot amu$ $(0.6917xx63+0.3083xx65)*"amu"$ $=$ $=$ $?? amu$ $"?? amu"$ .

Note that we have not accounted for the less massive copper isotopes that would decrease this mass to the accepted value of $63.55$ $63.55$ $amu$ $"amu"$ .

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A sample of copper (Cu) contains 69.17% Cu-63. The remaining copper atoms are Cu-65. What is the average atomic mass of copper?

1 Answer

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