Chapter 3, Problem 4SC

Copper is composed of two naturally occurring isotopes: $\text{Cu-63}$ with a mass of $\text{62}\text{.94 amu and Cu-65}$ with a mass of $\text{64}\text{.93 amu}\text{.}$ Look up the atomic mass of copper and determine which of the two isotopes is more abundant.

$\begin{array}{l}\begin{array}{l}\text{a}\text{. Cu-63 is more abundant}\text{.}\hfill \\ \text{b}\text{. Cu-65 is more abundant}\text{.}\hfill \end{array}\\ \text{c}\text{. Both isotopes are equally abundant}\text{.}\end{array}$