Na(g) → Na+(g) +
1e - → First ionization energy, IE
1e -→ Cl-(g) → electron affinity, EA
Na(g) + Cl(g) → Na+(g) + Cl-(g) ΔE = IE + EA
Using the data in the figures above calculate delta E for the reaction Na(g)+ Cl(g) → Na+(g)+ Cl-(g) in kJ/mol
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