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CAT(S) & FINAL EXAM REVIEW WITH VERIFIED ANSWER
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---14November 20252025/2026A+
- CAT(S) & FINAL EXAM REVIEW 
WITH VERIFIED ANSWER 
lattice energy (U or H_latt) - 
THE :>CORRECT ANSWER -The energy required to change 1 
mole of an ionic compound to its gaseous ions 
Below is lattice dissociation process 
NaCl(s) ------> Na+(g) + Cl-(g) ΔH = +787 kJ/mol ----> this amount of energy is required to 
break the ionic lattice 
Na+(g) + Cl-(g) ------> NaCl(s) ΔH = -787kJ/mol 
this amount of energy is released when Na+ and Cl- form solid NaCl 
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