Born Haber cycle is used to determine:
Correct answer: B. Lattice energy
- A. Electron affinity
- B. Lattice energy
- C. Crystal energy
- D. Both B and C
Explanation
The Born-Haber cycle is a thermochemical cycle that allows us to calculate the lattice energy of an ionic compound by considering the various energy changes involved in its formation. It uses Hess's Law to sum the enthalpy changes for individual steps, including ionization energy and electron affinity. Option A, 'Electron affinity,' while related to the cycle, does not represent the main purpose of the Born-Haber cycle, which focuses on lattice energy. Option C, 'Crystal energy,' is not a recognized term and does not apply, making it incorrect. Option D is also incorrect as it includes the invalid term 'crystal energy.' Thus, the correct and most relevant answer is Option B, 'Lattice energy,' as it directly corresponds to the primary purpose of the Born-Haber cycle.
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About Lattice Energy
Lattice energy describes the energy released when gaseous ions form one mole of an ionic solid, or the energy required to separate that solid into gaseous ions, depending on the convention used. Its value depends mainly on ionic charge and radius and is calculated through Born-Haber cycles.
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