Constants ; PenoacTabi â¼ Part A Magnesium has tree naturally eccuming isotopes Mg 24 with mass 24 3050 amu and a natural abundance of 78 99 % Mg 25 wm mass 24 9858 amu and a natural abundance or 10 00 % and 1101% Calculate the atomic mass of magnesium Express your answer using four significant figures with mass 25 9826 amu and a natural abundance of Submit