Mass spectrometry multiple choice questions – A-Level Chemistry (Edexcel)

Mass Spectrometry

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A sample of element X is analysed using mass spectrometry. The mass spectrum obtained is shown.

Mass spectrum showing relative abundance of isotopes of element X with peaks at m/z 112, 114, and 115.

What is the relative atomic mass of this sample of element X?

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2 of 7

Bromine has two isotopes with relative isotopic masses 79 and 81.

Which of the following values for mass/charge ratio could correspond to a peak in the mass spectrum of bromine, Br₂?

You should assume the ions detected have a single positive charge.

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What is correct about a mass spectrum of a compound?

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The mass spectrum of ethanoic acid has a peak at m/z 45. Which species could cause this?

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Chlorine exists as two isotopes ³⁵Cl and ³⁷Cl in the ratio 3:1.

Which statement about peaks in the mass spectrum of Cl₂ is correct?

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What is always correct about the molecular ion, M⁺, in a mass spectrum of a compound?

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Propanal (CH₃CH₂CHO) and propanone (CH₃COCH₃) are isomers.

Which m/z peak would not be expected in the mass spectrum of propanone?

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