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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

The highest mass peaks in the mass spectrum of Br2 occur at m/Z 158, 160, and 162. The ratio of intensities of these peaks is approximately 1:2:1. Bromine has two stable isotopes, 79Br (50.7% abundance) and 81Br (49.3% abundance).

(a) What molecular species gives rise to each of these peaks?

(b) Explain the relative intensities of these peaks. (Hint: Consider the probabilities of each atom combination.)

(a)

Interpretation Introduction

Interpretation: For the mass spectrum of Br2, the molecular species give peaks at m/Z ratios of 158, 160, and 162 are needed to be determined.

Concept introduction:

Mass spectroscopy: It is a form of spectroscopic technique which is used for the elucidation of the molecules, depending upon the mass of the molecule.

Parent ion peak: It is defined as the prominent peak in the mass spectrum of the molecule which represents the not fragmented molecular ion in the given molecule with greater m/z value.

Base peak: It is the tallest peak in the spectrum.

Br2 ionize to form positive ions, Br2+andBr+.

Elements present in Br2 are 79Brand81Br.

Explanation

m/Z ratios of 158, 160, and 162 shows prominent peaks, so they are Br2+.

The elements present in Br2+ are 79Brand81Br, so the m/Z (charge is taken as 1)

ratios of two different combination of 79Brand81Br are,

m/Zratio:1×79Br+1×79Br=158

(b)

Interpretation Introduction

Interpretation:

For the mass spectrum of Br2, the relative intensities of the peaks has to be explained.

Concept introduction:

Mass spectroscopy: It is a form of spectroscopic technique which is used for the elucidation of the molecules, depending upon the mass of the molecule.

Parent ion peak: It is defined as the prominent peak in the mass spectrum of the molecule which represents the not fragmented molecular ion in the given molecule with greater m/z value.

Base peak: It is the tallest peak in the spectrum.

Br2 ionize to form positive ions, Br2+andBr+.

Elements present in Br2 are 79Brand81Br.

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