Chapter 22, Problem 22.17P

(a)

Interpretation Introduction

Interpretation:

The nominal mass of the given molecular ion has to be found.

Concept introduction:

Nominal mass:

The nominal mass is nothing but the integer masses of the species along with the most abundant isotope of each of the constituent atoms.

(b)

Interpretation Introduction

Interpretation:

The monoisotopic mass of ${\text{C}}_{\text{72}}{\text{H}}_{\text{146}}{}^{+·}$ has to be found.

Concept introduction:

Mono-isotopic mass:

Mono-isotopic mass is nothing but the exact mass of the species with the most abundant isotopes of each of the constituent atoms.

(c)

Interpretation Introduction

Interpretation:

The relative abundance of M and M+1 form the given mass spectrum has to be predicted.

Concept introduction:

Relative abundance:

• The percentage of a naturally occurring of an isotope is said to be relative abundance.
• The total sum of the percentages of the isotopes is must be $100\%.$
• We can weigh the relative atomic mass by average of the isotopic masses.