Chapter 2 - Atoms, Molecules, and Ions - Exercises: 2.36

85.4681 amu

Work Step by Step

To find the atomic weight (the average atomic weight), we need to take the weighted average of the two isotopes. To do this we take the sum of each isotopes mass in amu * each isotopes abundance as follows: 84.9118amu * 0.7215 + 86.9092amu * 0.2785 = 85.4681 amu

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.