The lattice enthalpy of an ionic compound is the enthalpy change for the dissociation of one mole of an ionic compound present into gaseous state, dissociates into its ions. Itis impossible to determine it directly by experiment.Suggest and explain an indirect method to measure lattice enthalpy of `NaCI(s)`.

Explanation

To determine the lattice enthalpy of NaCl(s) indirectly, we can use the Born-Haber cycle, which is based on Hess's Law. Here’s a step-by-step explanation of how to apply this method:

### Step 1: Understand the Born-Haber Cycle
The Born-Haber cycle is a thermodynamic cycle that relates the lattice enthalpy of an ionic compound to other measurable thermodynamic quantities. It involves several steps that include the formation of ions from the solid ionic compound and the formation of the solid from its gaseous ions.

### Step 2: Identify the Steps in the Cycle
For NaCl, the Born-Haber cycle includes the following steps:
1. **Sublimation of Sodium (Na)**: Convert solid sodium to gaseous sodium.
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