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    I am having some trouble correctly calculating the binding energies of nuclei. My exam board is AQA.
    The question is this (if you have the physics A textbook, it's p187):

    2. Calculate the binding energy per nucleon, in MeV per nucleon, of:
    a) a carbon-12 nucleus (A=12, Z=6, mass 12u)
    b) an iron nucleus (A=56, Z=26, mass 55.92067 u)
    (mass of proton = 1.00728, mass of neutron = 1.00867)

    I have used the following equations:
    mass defect = Z1.00728 + (A-Z)1.00867 - mass of nucleus in u
    binding energy = mass defect x c2

    I tried the worked example for myself and got the same answer as the book, but for the questions above I couldn't even get close to the answers in the back of the book. I've checked and checked my working out, I've done exactly as the worked example tells me to, and I still can't get the right answer.
    Please help!
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