Chemistry · May / June 2025 · Paper 11 · Question 5
5070Isotopes
A pure sample of element X has a relative atomic mass of 51.8. The sample consists of three isotopes. The table shows the relative masses and percentage abundances of two of the isotopes. [table: relative mass of isotope 50, percentage abundance 40; relative mass 55, percentage abundance 20] What is the relative mass of the third isotope?
- A51
- B52
- C53
- D54
As printed in the paper
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Correct answer: B. 52
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