CAIE A-Level Chemistry AS 22.2.1 Analyse Mass Spectra Questions

Practise CAIE 9701 mass spectra by matching m/e to ions, calculating isotope abundance and using linked peaks to identify elements or structures.

Exam points

identify an ion by matching its mass and charge to the observed m/e, including multiply charged ions
relate peak-height ratios to natural isotope abundances rather than to different ion stability alone
use linked isotope peaks and fragment evidence together when suggesting a molecular structure

[Maximum number: 1]

Oxygen has three stable isotopes, ${ }^{16} \mathrm{O},{ }^{17} \mathrm{O}$ and ${ }^{18} \mathrm{O}$ . All three isotopes are present in a sample of oxygen gas, $\mathrm{O}_{2}$ , which was analysed using a mass spectrometer.

How many peaks associated with the $\mathrm{O}_{2}{ }^{+}$ ion would be expected?

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CAIE A-Level Chemistry AS 22.2.1 Analyse Mass Spectra Questions question 1