Chapter 2, Problem 2.86PAE

2.86 For some uses, the relative abundance of isotopes must be manipulated. For example, a medical technique called boron neutron capture therapy needs a higher fraction of ¹⁰B than occurs naturally to achieve its best efficiency. What would happen to the atomic weight of a sample of boron that had been enriched in ¹⁰B? Explain your answer in terms of the concept of a weighted average.