Copper has only two naturally occurring isotopes, Cu-63and Cu-65. The mass of Cu-63 is 62.9396 amu, and themass of Cu-65 is 64.9278 amu. Use the atomic mass of copperto determine the relative abundance of each isotopein a naturally occurring sample. (Hint: The relative abundancesof the two isotopes sum to 100%.)

Chemistry: Matter and Change
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Chapter4: The Structure Of The Atom
Section: Chapter Questions
Problem 102A
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Copper has only two naturally occurring isotopes, Cu-63
and Cu-65. The mass of Cu-63 is 62.9396 amu, and the
mass of Cu-65 is 64.9278 amu. Use the atomic mass of copper
to determine the relative abundance of each isotope
in a naturally occurring sample. (Hint: The relative abundances
of the two isotopes sum to 100%.)

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