For the ionic compound MX2, made up of generic metal M and generic, gaseous halo

Question

For the ionic compound MX2, made up of generic metal M and generic, gaseous halogen X, the steps of the Born- Haber cycle are shown here. Write the overall reaction, and identify the name of the enthalpy change for each reaction Reaction Enthalpy 1st ionization energy m(s) Mg) Enthalpy of sublimation (enthalpy of atomization) Step 1 Step 2 Step 3: Step 4 Step 5 Bond energy of X-X - Lattice energy 2nd ionization energy M2e1st+2nd ionization energies Electron affinity 2x(g)+2e- 2x 2x Electron affnity M2+(x) + 2X(g) I2+(g+2X MX2(s) Mx,sEnthalpy of formation of MX2 Overall reaction: | M(s)+X MX,(s ncluding phases) Lattice energy

Explanation / Answer

You have matched everything correctly except Step 5 and the overall reaction:
The Step 5 gives the Lattice Energy.
The addition of all the energies of 5 steps gives the enthalpy of formation of MX2 in the Overall reaction.
Therefore Step 5: Lattice Energy
Overall reaction: Enthalpy of formation of MX2.

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