Answer to Question #68922 in Atomic and Nuclear Physics for DEEPENDRA SINGH

Question

the atomic mass of Cu is 63.546.two isotops of Cu is Cu(63) and Cu(65).what is the quantity of Cu(63) which is found in nature?

Answer 1

Let us denote the quantity of Cu(63) as x. Then
63x+65(1-x)=63.546
2x=1.454
x=0.727
Thus the quantity of Cu(63) in nature is 72.7%
Answers: 72.7%