Consider an ionic compound, MX2, composed of generic metal M and generic, gaseou

Question

Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X.....Determine the lattice energy of MX2.....PLEASE HELP

Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X. The enthalpy of formation of MX2 is AH 683 kJ/mol. The enthalpy of sublimation of M is sub 115 kJ/mol. The first and second ionization energies of M are IE1 637 kJ/mol and IE 1.360 x 103 J/mol The electron affinity of Xis AHEA 301 kJ/mol. (Refer to the Hint) The bond energy of X2 is BE 223 kJ/mol. Determine the lattice energy of MX Number kJ mol AH attice

Explanation / Answer

Lattice energy is used to estimate ionic strengths. Its equal to energy released when ions react.

Enthalpy of formation of MX2

M(s) + X2(g) ------- MX2(s) is -683kj/mol

Enthalpy of sublimation of M

M(s) ----- M(g) is delta H(sub) = 115 kj/mol

First ionisation energy of M

M(g) -----M+(g) + e- is 637 kj/mol

Second ionisation for M

M+ (g) ------ M2+ (g) + e- is 1360 kj/mol

Electron affinity for halogen 2X2(g) + 2e- ------2X- is -301 kj/mol

enthalpy of formation ( -683) = LE + 2( -301) + 223 + 1360 +637 + 115

LE = -2416 kj/mol

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