AP Chemistry
1.2 Mass Spectra of Elements
A sample of copper extracted from a newly discovered meteorite is analyzed using mass spectrometry. The isotopic masses and their relative percent abundances in the extraterrestrial sample are shown in the table below. (For reference, the average atomic mass of terrestrial copper is \(63.55\text{ amu}\).)
| Isotope | Isotopic mass (\(\text{amu}\)) | Relative abundance |
| :--- | :--- | :--- |
| \(^{63}\text{Cu}\) | \(63.00\) | \(20.0\%\) |
| \(^{65}\text{Cu}\) | \(65.00\) | \(80.0\%\) |
Based on the data, what is the average atomic mass of copper in this extraterrestrial sample?
| Isotope | Isotopic mass (\(\text{amu}\)) | Relative abundance |
| :--- | :--- | :--- |
| \(^{63}\text{Cu}\) | \(63.00\) | \(20.0\%\) |
| \(^{65}\text{Cu}\) | \(65.00\) | \(80.0\%\) |
Based on the data, what is the average atomic mass of copper in this extraterrestrial sample?
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