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From the following list of enthalpies, how many are NOT required to construct the Born-Haber cycle for NaI? Delta_H_sub(Na), Delta_H_sub(I2), Delta_H_diss(I2), Delta_H_hyd(Na+), Delta_H_hyd(I-), Delta_H_E(I), Delta_H_eg1(I), Delta_H_LE(NaI), Delta_H_ie(Na)

1. 0
2. 1
3. 2
4. 3

Correct answer: 3

Solution

The Born-Haber cycle for NaI requires: sublimation of Na, dissociation of I2 (including sublimation of solid I2), ionisation energy of Na, electron gain enthalpy of I, and lattice enthalpy. Hydration enthalpies (Na+ and I-) and Delta_H_E(I) (electrode potential) are NOT part of the Born-Haber cycle — that is 3 enthalpies.

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