Chapter 2, Problem 2.170MP

Interpretation Introduction

Interpretation:

The molecular mass of acetaminophen $\left({\text{C}}_8{\text{H}}_9{\text{NO}}_2\right)$ is to be calculated.

Concept introduction:

Atomic weight of the element represents weighted average of mass of isotopes that naturally occurrs in nature. For example, carbon has two major naturally occurring isotopes ${}_6^{12}\text{C}$ and ${}_6^{13}\text{C}$. Therefore, the atomic weight can be represented as follows:

$\text{Atomic weight of C}=\left(\begin{array}{l}\left({\text{Mass of }}_6^{12}\text{C}\right)\left({\text{Abundance of }}_6^{12}\text{C}\right)\\ +\left({\text{Mass of }}_6^{13}\text{C}\right)\left({\text{Abundance of }}_6^{13}\text{C}\right)\end{array}\right)$