EBK EXPLORING CHEMICAL ANALYSIS
EBK EXPLORING CHEMICAL ANALYSIS
5th Edition
ISBN: 8220101443908
Author: Harris
Publisher: MAC HIGHER
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Chapter 21, Problem 21.22P
Interpretation Introduction

Interpretation:

Expected mass of C4H11N3S+ and C4H11N3O+ has to be computed and ion that corresponds to measured m/z value of 133.0686 has to be identified.

Concept Introduction:

Molecular mass is defined as mass corresponding to mass of one molecule of substance, while nominal mass may be defined as mass of most abundant isotope of a particular ion or molecule. For instance, carbon exist as two isotopes C-12 and C-13. C-12 is abundant as much as 98.9 % while abundance of C-13 is only 1.1 %. So clearly nominal mass of carbon is 12 g.

For instance, molecular mass of benzene is calculated by exact atomic masses of C and H atom as follows:

  Molecular mass of C6H6=(6)(12.0107 u)+(6)(1.0078 u)=78.111 u

However, its nominal mass will take most abundant masses of C and H atoms into account and thus nominal mass is calculated as follows:

  Nominal mass of C6H6=(6)(12 u)+(6)(1 u)=78 u

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Transmitance 3. Which one of the following compounds corresponds to this IR spectrum? Point out the absorption band(s) that helped you decide. OH H3C OH H₂C CH3 H3C CH3 H3C INFRARED SPECTRUM 0.8- 0.6 0.4- 0.2 3000 2000 1000 Wavenumber (cm-1) 4. Consider this compound: H3C On the structure above, label the different types of H's as A, B, C, etc. In table form, list the labeled signals, and for each one state the number of hydrogens, their shifts, and the splitting you would observe for these hydrogens in the ¹H NMR spectrum. Label # of hydrogens splitting Shift (2)
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