on this scale C-12 has an excess mass of 0.0000 MeV
For any other nuclide multiply the number of nucleons N x 9.320x10^2
and add the excess mass, and you have the mass of that nuclide in
Mev... well not really the mass, but the energy equivalent of the mass.
Hope that helps.
Dr. Mark H. Shapiro
California State University, Fullerton
Fullerton, California 92634