Two isotopes of a certain element have binding energies that differ by 5.28 MeV. The isotope with the larger binding energy contains one more neutron than the other isotope. Find the difference in atomic mass between the two isotopes, by taking the energy equivalent of 1 u to be 931.502 MeV.
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The heavier one has + 1u, minus the mass equivalent of 5.28 MeV, which is 5.28/931.502 u.