Question

The average atomic mass of copper is 63.5 amu.if the only two isotopes of copper have a mass number 63 and 65,calculate the percentage abundance of each isotope

Answer 1

Let abunadance be x and y=(100-x)

63.5=[63x+65(100-x)]÷100

6350====63x+6500-65x

(-150)====(-2x)

X=75

Y=25