Edexcel A-Level Chemistry AS 2.7 Predict Mass Spectra Questions

Practise predicting chlorine and bromine molecular-ion m/z peaks, relative peak-height ratios and molecular masses from isotope masses and abundances using Edexcel IAL Chemistry evidence.

Exam points

Predict molecular-ion m/z peaks for diatomic chlorine or bromine from isotope masses.
Use isotope abundances to calculate relative molecular-ion peak-height ratios.
Interpret diatomic molecular-ion spectra to determine composition and relative molecular mass.

[Maximum number: 2]

Naturally occurring bromine has two isotopes: bromine-79 and bromine-81.

The mass spectrum of a sample of bromine is obtained.

On the mass spectrum grid, draw the peaks for the bromine molecular ions, showing the relative peak heights.

The bromine isotopes in this sample have the same relative abundance.

Relative abundance

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Edexcel A-Level Chemistry AS 2.7 Predict Mass Spectra Questions question 1