Question

In nature, oxygen has three common isotopes. The atomic masses and relative abundances of these isotopes are given in the table below.

Isotope Atomic Mass (amu) Relative Abundance
O-16          15.995                          99.759%
O-17          16.995                             0.037%
O-18          17.999                               0.204%
Calculate the average atomic mass of oxygen. Show all of your calculations below.

Answer 1

shown in picture below

Step-by-step explanation:

Answer 2

15.995* 0.99759 + 16.995*0.00037 + 17.999*0.00204 = 15.999