# What is chemical binding energy? [duplicate]

Chemical binding energies are all to do with atoms being bound together and are of order of magnitude electron volts $(1 \rm eV \approx 1.6 \times 10^{-19} \rm J)$ whereas nuclear binding energies are order of magnitude a million times larger. In chemistry it is usual to measure that quantity in terms of a mole of bonds rather than per one bond.