7) magnesium consists of three naturally occurring isotopes. the percent abundance of
these isotopes is as follows: "mg (78.70%), mg (10.13%), and "mg (11.7%). the average
iss of the three isotopes is 24.3050 amu. if the atomic mass of -mg is 24.98584
amu, and mg is 25.98259 amu, calculate the actual atomic mass of mg.