Einstein showed the relationship between energy and mass: E=mc2
Energy obtained from a nuclear process is much greater than a chemical
reaction; note the c2 term in Einstein’s equation.
Consider 238U g 234Th + 4He
for 1 mol of 238U, 238.0003g g 233.9942 g + 4.0015 g + E
the change in mass during reaction is:
Thorium and Helium mass - Uranium mass = change in mass