Chemistry · Oct / Nov 2024 · Paper 12 · Question 4
5070Isotopes
A sample of element Q contains two isotopes. The diagram shows the relative abundances and relative masses of the two isotopes. [diagram: bar chart of relative abundance against relative mass, with peaks at relative mass 20 (abundance 1) and 22 (abundance 5)] What is the relative atomic mass, $A_r$, of this sample of Q?
- A21.0
- B21.2
- C21.5
- D21.7
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Correct answer: D. 21.7
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