A scientist discovered a new element that has two

naturally occurring isotopes. The first isotope has

13.2959 amu and the second isotope has 15.9921

amu. If the element has an atomic mass of 14.9362

amu, what is the percent abundance of each

isotope?

a. [6 pts] The general equation to calculate the

atomic mass of the element is

b. [7 pts] The percentage abundance of the first

isotope is ◆ Unit is

4

c. [7 pts] The percentage abundance of the second

isotope is

◆ Unit is

Note: Choose the closest value.