Chapter 2, Problem 99P

Interpretation Introduction

Interpretation: The percent abundance of ${}^{39}\text{K}$ and ${}^{40}\text{K}$ needs to be calculated.

Concept Introduction:For element with 3 isotopes, the formula to calculate average atomic weight of an element is as follows:

$M=\%A\times m\left(isotop{e}_1\right)+\%A\times m\left(isotop{e}_2\right)+\%A\times m\left(isotop{e}_3\right)$

Here. %A is percentage abundance of the respective isotopes.