# What is chemical binding energy? [duplicate]

Like in nuclear physics we deal with binding energies, i heard someone saying Chemical binding energy. What is that and how a chemical reaction follows mass energy interconversion based on this concept like a nuclear reaction follows?

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.