Lattice enthalpy and enthalpy of solution of NaCl are and respectively. The hydration enthalpy of NaCl is:

Question

Lattice enthalpy and enthalpy of solution of NaCl are  and  respectively. The hydration enthalpy of NaCl is:

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Strategy:
 The enthalpy of solution is the sum of the lattice enthalpy (energy to break the ionic lattice) and the hydration enthalpy (energy released when ions are solvated).

Step 1: Substitute the given values
Given:
- 
-  (Lattice energy required)

Step 2: Solve for

.
The negative sign indicates that hydration is an exothermic process.

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