Question

Naturally occurring copper has two isotopes with relative atomic masses 62.93 and 64.928. if the average relative atomic mass is 63.546, what are the relative % abundances of the two isotopes in this sample.

Answer 1

The relative abundance of the isotope with mass 62.93 is $0.75=75\%$ . Therefore, the relative abundance of the 64.928isotope is $=0.25=25\%$