The lattice enthalpy of an ionic compound is the enthalpy when one mole of an ionic compoud present in its gaseous state, dissociates into its ions. It is impossible to determine it directly by experiment. Suggest and explain in indirect method to measure lattice enthalpy of NaCl(s).

Explanation

To determine the lattice enthalpy of NaCl(s) indirectly, we can use the Born-Haber cycle, which allows us to break down the formation of NaCl from its elements into several steps. Here’s a step-by-step solution:

### Step 1: Write the Reaction for Lattice Enthalpy
The lattice enthalpy of NaCl can be represented by the following reaction:
\[ \text{NaCl(s)} \rightarrow \text{Na}^+ (g) + \text{Cl}^- (g) \]
This reaction represents the dissociation of one mole of solid NaCl into its gaseous ions.

### Step 2: Identify the Steps in the Born-Haber Cycle
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