1
Question
In the Born Haber cycle for the formation of solid common salt (NaCl), the largest contribution comes from:
In the Born Haber cycle for the formation of solid common salt (NaCl), the largest contribution comes from:
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Solution
The correct option is D The Lattice energy
Normally lattice energy plays a very important role in formation of ionic compounds. Electron affinity values are normally low comparitively and lattice energy must compensate for ionization and sublimation energy of metal as well as bond dissociation energy involved. of the nonmetal. For example:
(Here, do recall from periodic properties that chlorine has highest electron affinity and alkali metals in general have low ionization energy)
The ionisation energy of Na is, IE=496 kJ
Electron affinity of Cl is, EA=−349 kJ/mol
Sublmation enhthalpy of Na is ΔHsub=108 kJ/mol
The Lattice energy =−788 kJ/mol
Dissociation enthalpy of Cl2=122 kJ/mol
From the above we can clearly see that the largest contributions comes from the lattice energy in the Born Haber cyle.
Normally lattice energy plays a very important role in formation of ionic compounds. Electron affinity values are normally low comparitively and lattice energy must compensate for ionization and sublimation energy of metal as well as bond dissociation energy involved. of the nonmetal. For example:
(Here, do recall from periodic properties that chlorine has highest electron affinity and alkali metals in general have low ionization energy)
The ionisation energy of Na is, IE=496 kJ
Electron affinity of Cl is, EA=−349 kJ/mol
Sublmation enhthalpy of Na is ΔHsub=108 kJ/mol
The Lattice energy =−788 kJ/mol
Dissociation enthalpy of Cl2=122 kJ/mol
From the above we can clearly see that the largest contributions comes from the lattice energy in the Born Haber cyle.
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