Lattice Enthalpies

Lattice (Formation) Enthalpy is defined as:

The enthalpy change when one mole of an ionic lattice is formed from its constituent ions in a gaseous state.

atomisation

Enthalpy change when one mole of atoms is formed

removal of one electron from each atom in one mole of gaseous atoms to form one mole of gaseous ions

To answer this question you need to be confident about the definition of each of the enthalpy changes involved.

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