Question

Calculate the average atomic mass of magnesium using the following data for

three magnesium isotopes.
Isotope
mass (u)
relative abundance
Mg-24
23.985
0.7870
Mg-25
24.986
0.1013
Mg-26
25.983
0.1117

Answer 1

24.310

Step-by-step explanation:

Take the weighted average of weach isotope and add them to arrive at 24.310 average atomic mass.

Mg-24 23.985 78.70% 18.876

Mg-25 24.986 10.13% 2.531

Mg-26 25.983 11.17% 2.902

100.0% 24.310