For the ionic compound MX, made up of generic metal M and Generic, gaseous halog

Question

For the ionic compound MX, 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

Overall reaction and enthalpy:

Choices for Enthalpy= 1/2 bond energy of X-X, Enthalpy of formation of MX, Ionization energy, eletron affinity, lattice energy, bond energy of X-X, -lattice energy, enthalpy of sublimation

For the ionic compound MX, 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 M+(g) + X-(g) MX(s) Overall reaction and enthalpy: Choices for Enthalpy= 1/2 bond energy of X-X, Enthalpy of formation of MX, Ionization energy, eletron affinity, lattice energy, bond energy of X-X, -lattice energy, enthalpy of sublimation

Explanation / Answer

Overall reaction is :-

M(s) + (1/2)*X2(g) -------------> MX(s)

Now, M(s) ------> M(g) ; +ve enthalpy & endothermic reaction

(1/2)*X2(g) -------> X(g) ; +ve enthalpy & endothermic reaction

M(g) --------> M+(g) + e- ; +ve enthalpy & endothermic reaction

X(g) + e- ------> X-(g) ; -ve enthalpy & exothermic reaction

Enthalpy of overall reaction = (1/2)*bond energy of X-X + Ionization energy + enthalpy of sublimation - electron affinity - lattice enthalpy

Note, only numerical values of enrgy are to be put in the formula of the enthaly of the overall reaction to get the right result

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