The isotope Cobalt-60 has a nuclear mass of 59.933820 u
Calculate the Mass Defect of Cobalt-60 using the following information.
Mass of Proton: 1.007825 u
Mass of Neutron: 1.008665 u
1 u = 931.5 MeV

Question

The isotope Cobalt-60 has a nuclear mass of 59.933820 u
Calculate the Mass Defect of Cobalt-60 using the following information.
Mass of Proton: 1.007825 u
Mass of Neutron: 1.008665 u
1 u = 931.5 MeV

anonymous · Answer

cobalt has 27 protons and 33 neutrons in its nucleus 
so 
     M=27*1.007825u+33*1.008665u
         =27.211u+33.285u
        =60.496u

But the measured mass of co-60 is given as 59.933820 u

    $$DeltaM=M-measured mass$$

   $$DeltaM=60.496u-59.933820 u$$

   MASS DEFECT =0.56218u
              = 0.56218*931.5 Mev
MASS DEFECT =523.670 Mev