• Dec 25, 2025 Atomic Mass Of Graphite s or the overall weighted average. To reiterate, the atomic mass focuses on the mass of the atom itself, not its arrangement in a larger structure. Practical Example: Imagine a bag containing 989 marbles weighing 12 amu each and 11 marbles weighing 13 amu each. The average mas BY Mr. Marc Aufderhar-Zemlak