Question: In a mass spectrometer, positive ions are produced when a gaseous mixture is ionized by electron bombardment produced by an electric discharge. When the electric-discharge

In a mass spectrometer, positive ions are produced when a gaseous mixture is ionized by electron bombardment produced by an electric discharge. When the electric-discharge voltage is low, singly positive ions are produced and the following peaks are observed in the mass spectrum:

Mass (amu) Relative Intensity

32….................................................... 0.3743

34….................................................... 0.0015

40…..................................................... 1.0000

When the electric discharge is increased, still only singly charged ions are produced, but now the peaks observed in the mass spectrum are

Mass (amu) Relative Intensity

16….................................................... 0.7500

18…..................................................... 0.0015

40 ….................................................... 1.0000

What does the gas mixture consist of, and what is the percent composition by isotope of the mixture?

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