Chapter 1, Problem 1.87SP

Interpretation Introduction

Interpretation:

The natural abundance of ${}^{\text{28}}\text{Si}\text{and}{}^{\text{30}}\text{Si}$ has to be calculated.

Concept introduction:

The atomic weight of an element is the weighted average of the atomic masses of the element’s naturally occurring isotopes as well as is equal to the sum of the masses of each isotope times the natural abundance of that isotope.

Atomic weight:

$\text{(Mass of}{}_{}^{28}\text{Si )}\text{(}\text{Abundance}{}_{}^{28}\text{Si )}\text{+}\text{(Mass of}{}_{}^{29}\text{Si )}\text{(}\text{Abundance}{}_{}^{29}\text{Si )}\text{+}\text{(Mass of}{}_{}^{30}\text{Si )}\text{(}\text{Abundance}{}_{}^{30}\text{Si )}$