# Confusion about definition of Bond Enthalpy [closed]

My Chemistry textbook defines bond enthalpy as "amount of energy required to break one mole of bonds of a particular type between two atoms in gaseous state". Can someone confirm to me whether

a particular type

is related to bond order, to the atoms involved, both, or something else?

Also, should not the bond enthalpy of all diatomic molecules be large as one mole of bonds to be broken. But this does not happens. Why?

• Well, it is pretty large. – Ivan Neretin Oct 4 '17 at 15:37

$$\ce{A<=>B}$$