Question

The isotopes of magnesium (and their percent abundance) are Mg-24 (79.0%), Mg-25 (10.0%), and Mg-26 (11.0%). Calculate the average atomic mass of magnesium.

Answer 1

Average atomic mass= 24.32 amu.

Step-by-step explanation:

average atomic mass= (mass x percentage abundance) + (mass 2 x percentage abundance 2) + (mass 3 x percentage abundance 3)/ 100

Ar = [( 24 x 79.0) + (25 x 10) + (26 x 11.0)] /100

Ar = 24.32 amu