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4 marksMass Spectroscopy

CAPE Chemistry Unit 2 · 2008 (T&T) · Paper 2 · Question 5(c)(i)

Mass spectrum of molecular bromine vapour.

Sketch the mass spectrum of bromine vapour in the m/e region indicated in Figure 3 (m/e 156 to 163).

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Other parts of this question

  1. 5(a)(i)Identify the parts of the mass spectrometer numbered (2), (3), (4), and (5) in Figure 2.[4 marks]
  2. 5(a)(ii)What is the purpose of the heated filament, (1)?[2 marks]
  3. 5(b)Data from the mass spectrum of bromine gives mass numbers 79 (50.5%) and 81 (49.5%). Calculate to 3 significant figures the relative atomic mass of bromine.[2 marks]
  4. 5(c)(ii)What is the origin of EACH of the THREE peaks in your spectrum?[3 marks]

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