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Which value would be required to estimate the lattice energy for the hypothetical ionic compound MgH2?

A the electron affinity

B the first ionisation energy

C the magnesium-hydrogen bond energy

D the standard enthalpy change of formation of MgH2

Verified Answer :

austinbaird

D, the energy of formation is equal to the dissociation. so from magnesium ions and Hydrogen ions, when they form the lattice energy is equal to formation-dissociation, as they aren't going to dissociate (fixed in lattice) the formation should be the same as the the overall lattice energy.

pstnonsonjoku

The parameter used to obtain the lattice energy of the hypothetical ionic compound MgH2 is the standard enthalpy change of formation of MgH2.

The lattice energy of an ionic compound can be estimated by relating it to other quantities in a thermochemical cycle called the Born-Haber cycle.

In the Born-Haber cycle, the following parameters are used to calculate the lattice energy:

  1. Enthalpy of atomization of Mg
  2. Enthalpy of atomization of H
  3. Sum of ionization energies for the formation of \(Mg^2+\).
  4. Electron affinity
  5. Standard enthalpy of formation

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