The binding energy of a potassium chloride molecule (KCl)

Chapter 42, Problem 42.38

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QUESTION:

The binding energy of a potassium chloride molecule (KCl) is 4.43 eV. The ionization energy of a potassium atom is 4.3 eV, and the electron affinity of chlorine is 3.6 eV. Use these data to estimate the equilibrium separation between the two atoms in the KCl molecule. Explain why your result is only an estimate and not a precise value.

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QUESTION:

The binding energy of a potassium chloride molecule (KCl) is 4.43 eV. The ionization energy of a potassium atom is 4.3 eV, and the electron affinity of chlorine is 3.6 eV. Use these data to estimate the equilibrium separation between the two atoms in the KCl molecule. Explain why your result is only an estimate and not a precise value.

ANSWER:

Step 1 of 2

Given

Bonding energy of KCl = 4.43 eV
Ionization energy of K = 4.3 eV
Electron affinity of Cl = 3.6 eV

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