Chapter 4, Problem 117E

Interpretation Introduction

Interpretation:

The relative abundance of each isotope of copper in a naturally occurring sample is to be determined.

Concept introduction:

Atoms of same element that have same atomic number but different mass number are called isotopes.

With the help of atomic mass, the relative abundance of each isotope is calculated as follows:

$\begin{array}{c}\text{Atomic mass}=\left(\text{Fraction of Cu-}63\times \text{Mass of Cu-}63\right)+\\ \left(\text{Fraction of Cu-}65\times \text{Mass of Cu-}65\right)\end{array}$

The fraction of isotopes is given by

$\frac{\text{Relative or natural abundance of isotopes}}{\text{100}}$