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Cameroon GCE A-Level Chemistry Practice Questions - Cameroon General Certificate Of Education Advanced Level Chemistry (Subject Code 0715) Exam

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Naturally occurring copper consists of two stable isotopes: 63Cu (relative isotopic mass 62.93, abundance 69.17%) and 65Cu (relative isotopic mass 64.93, abundance 30.83%). What is the relative atomic mass (Ar) of copper to two decimal places?
Correct Answer:
63.55

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