# Copper is listed on the periodic table as having a relative atomic mass of 63.55. Reference books indicate two isotopes of copper, with relative masses of 62.93 and 64.93. What is the percent abundance of each isotope?

##### 1 Answer

Dec 22, 2014

You can approach this problem by using a single equation; let's say the first isotope contributes to the relative atomic mass by a fraction

Let's set up the equation

Solving this for

Multiplying these fractions (0.69 and 1 - 0.69 = 0.31) by 100% percent to get the results as a percentage will give