Calculations in Chemistry:. Average Atomic Mass. Isotopes. An element can exist in a number of forms, called isotopes. Isotopes are forms of the same atom that vary in mass as a result of a different number of neutrons.
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Calculations in Chemistry:
Average Atomic Mass
Average atomic mass =
Σ (mass of isotope × relative abundance)
Σ = sum or to add them all together
Average atomic mass of copper =
(62.93 amu × 0.6909)
[the mass and abundance of isotope #1]
(64.94 amu × 0.3091)
[the mass and abundance of isotope #2]