Analysis of a copper-bearing mineral sample collected from a deep-sea hydrothermal vent reveals an unusual isotopic distribution of copper.
The sample contains only two isotopes of copper, 63Cu^{63}\text{Cu}63Cu and 65Cu^{65}\text{Cu}65Cu.
The table below shows the mass numbers and percentage abundances of these two isotopes in the hydrothermal vent sample.
| Isotope | Mass number | Percentage abundance (%) |
|---|---|---|
| 63Cu^{63}\text{Cu}63Cu | 63 | 68.7 |
| 65Cu^{65}\text{Cu}65Cu | 65 | 31.3 |
Calculate the relative atomic mass (ArA_rAr) of copper in this sample.
Give your answer to 1 decimal place.
41 exam-style questions on AQA GCSE Chemistry 1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, covering 1.1.1 Atoms, elements and compounds, 1.1.2 Mixtures, 1.1.3 The development of the model of the atom (common content with physics), 1.1.4 Relative electrical charges of subatomic particles, 1.1.5 Size and mass of atoms, 1.1.6 Relative atomic mass, and 1.1.7 Electronic structure. Each one has a worked solution and a mark scheme showing where the marks go.