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The enthalpy of formation of MX is ΔHf° = –527 kJ/mol. The enthalpy of sublimation of...

The enthalpy of formation of MX is ΔHf° = –527 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 139 kJ/mol. The ionization energy of M is IE = 475 kJ/mol. The electron affinity of X is ΔHEA = –309 kJ/mol. (Refer to the hint). The bond energy of X2 is BE = 223 kJ/mol.

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Direct process: M(s)+ X2(g)> MX(s); AH527 kJ Indirect process Sublimation M(s)M(g): S 139 kJ Ionizaton M(g)>M*(g) +le IE1 475

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