6/2017 11:30 PM 10.6/15 PrintCalculator Periodic Table n 6 of 30 Sapling Learnin

Question

6/2017 11:30 PM 10.6/15 PrintCalculator Periodic Table n 6 of 30 Sapling Learning Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X. The enthalpy of formation of MX2 is dH,-=-705 kJ/mol. The enthalpy of sublimation of M is AHub 147 kJ/mol. The first and second ionization energies of M are IE, 623 kJ/mol and IE2 1449 kJ/mol. The electron affinity of X is AHEA -351 kJ/mol. (Refer to the Hint). The bond energy of X2 is BE = 189 kJ/mol. Determine the lattice energy of MX2. Number kJ/ mol Hint O Previous check Answer 0 Next Exit F2 DOD FA

Explanation / Answer

Ans Heat of formation = I.E1 + I.E2 + sublimation energy + Bond energy + electron affinity + lattice energy

-705 = 623 + 1449 + 147 + 189 - 351 + lattice energy

lattice energy = - 2762 KJ/ mol

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