May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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40Atomic Structure IsotopesHard1 mark
The mass spectrum of an alloy of copper and gold is shown.
Mass spectrum: percentage abundance (vertical axis, 0 to 60) against $m/e$ (horizontal axis), with three peaks -- 56.36% at $m/e = 63$, 25.14% at $m/e = 65$, and 18.50% at $m/e = 197$.
Which expression can be used to calculate the relative atomic mass, , of copper present in this sample?