Homework Due 8.25.15

Do Now:
The % abundance of boron-10 is 19.9%
The % abundance of boron-11 is 80.1%
What is the average atomic mass of boron?

Read:
  Section 3.3 pp. 60-67
Do:
  Problems 1, 2, 3, 4, 5, 7 pg. 67
  Problems 17, 21 pg. 87