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If a sample of copper contains 69.1% of ...

If a sample of copper contains `69.1% of ` 63 Cu of isotopic mass `62.930` u and `30.9%of ""^(65) Cu` of isotopic mass `64.298 u.` Calculate the relative atomic mass of copper.

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`("Sum of % os isotope percent" xx "atomic mass")/(100)`
`63.547`
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