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?
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