Question

Born-Haber cycle may be used to

• A. to find out electron affinity of non-metal atom
• B. to find out lattice energy of the ionic compounds
• C. for the preparation of ammonia in industries
• D. both (a) and (b) above.

Answer 1

The correct option is B to find out lattice energy of the ionic compounds

Born-Haber cycle is used to calculate the lattice energy for an ionic compound. According to the cycle, the enthalpy of formation is equal to summation of sublimation energy of the metal atom, ionization energy required for the formation of metal cation, bond dissociation enthalpy, electron affinity of non-metal and lattice energy.
So, we can calculate lattice energy, provided all the other enthalpies are known.