Question

In the Born-Haber cycle for the formation of solid common salt ($Nacl$), the largest contribution comes from

• A. the low ionization potential of $Na$
• B. the high electron affinity of $Cl$
• C. the low $\Delta H_{vap}$ of $Na\left(s\right)$
• D. the lattice energy

Answer 1

The correct option is D the lattice energy

REF.Image

${\Delta }_{H{f}^{\circ }}=\Delta H_{sub}+IE+\Delta H_{diss}+EA+U$

${\Delta }_{H{f}^{\circ }}=108+496+122-349-788=-411kJ/mole$