Mass is not conserved in a nuclear reaction. The goods formed throughout nuclear fission have a somewhat smaller mass, due to the nuclear mass defect. This nuclear mass defect can be utilized to work out the nuclear binding power which held the heavier nucleus simultaneously and was issued when fission occurred. The power issued by fission can be calculated by finding the distinction between the mass of the parent atom and neutron, and the masses of the female child atoms and emitted neutrons, and altering this mass "loss" into power using.
Discussion
Neutrons issued when an atom undergoes fission ...