Explain the steps involved in Born Haber cycle for the formation of NaCl.

Explanation

Step 1: Sublimation of metalic sodium of gaseous sodium atom with enthalpy of sublimation `=DeltaH_(s)`
`Na(s)overset("sublimation")(to)Na(g),DeltaH=DeltaH_(s)`
Step 2: Dissociation of molecule of chlorine to chlorine atoms with enthalpy of dissociation `=DeltaH_(d)`
`1/2Cl_(2)(g)overset("Dissociation")(to)Cl(g),DeltaH=DeltaH_(d)`
Step 3: Ionization of gaseous sodium with enthalpy of ionization `=DeltaH_(i)`
`Na(g)overset("ionization")(to)Na^(+)(g)`
Step 4: Addition of electron to gaseous chlorine atom with enthalpy of electron affinity `=DeltaH_(Ea)`
`Cl_((g))+e^(-)overset("addition of" e^(-))(to) Cl^(-1)(g),DeltaH=DeltaH_(Ea)`
Step -5: Close packing of gaseous sodium ion and chloride ion to form lattice structure of NaCl, with lattice chloride ion to form lattice structure of NaCl, with Lattice energy `=U, NaCl^(+)(g)+Cl^(-1)(g)toNaClDelta, DeltaH=U`
Step 6: But sum of all the energies will be equal to the heat of formation of one mole of sodium chloride form its reluctant i.e. `DeltaH_(f)`
`Na(s)+1//2Cl_(2)(g)toNaCl(s),DeltaH=DeltaH_(f)`