Question

How would I solve this problem? How would I find the Atomic Mass for each isotope?

Answer 1

126.86 amu

Step-by-step explanation:

You divide each percent abundance by 100 and multiply it by the atomic masses and then add them all up to get the average atomic mass.

(.80 x 127) + (.17 x 126) + (.03 x 128) = 126.86 amu