A (s) + B (s) → AB (s) ΔrH = -413 kJ mol-1
A (s) → A (g) ΔrH1 = 113 kJ mol-1
B (s) → B (g) ΔrH2 = 115 kJ mol-1
First ionization energy of A (gas phase)
A(g) ------>A^+ (g) + e^- rH3 = 542KJ/mole
Electron affinity of B (taking into account it's exothermic, gas phase)
B(g) + e^- -----> B^- (g) rH4 = -394Kj/mole
lattice energy
A^+(g) + B^- (g) ---------------> AB(g) rH5 =
from Hess law
rH = rH1 + rH2 + rH3 + rH4 + rH5
-413 = 113 + 115 + 542 -394 + rH5
rH5 = -789KJ/mole
lattice energy of AB = -789KJ/mole
ΔrH2
Consider a hypothetical ionic compound AB (comprised of A+ and B- ions). Given the following enthalpy...
Consider a hypothetical ionic compound AB (comprised of A+ and B- ions). Given the following enthalpy data and using a Born-Haber cycle calculation, predict ΔHlattice in kJ mol-1. A (s)+ B (s) → AB (s) ΔH = -370 kJ mol-1 A (s)→ A (g) ΔH = 110 kJ mol-1 B (s)→ B (g) ΔH = 91 kJ mol-1 First ionization energy of A (gas phase) = 481 kJ mol-1 Electron affinity of B (taking into account it's exothermic, gas phase)...
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Consider an ionic compound, MX2 composed of generic metal M and generic, gaseous halogen ?. The enthalpy of formation of MX2 is 사4°-_653 kJ/mol. The enthalpy of sublimation of M is dHsb = 1 17 kJ/mol. The first and second ionization energies of M are IE1-711 kJ/mol and IEz 1.370 x10 kJ/mol. The electron affinity of X is AHEA-321 kJ/mol. (Refer to the Hint). The bond energy of X2 is BE 173 kJ/mol. Determine the lattice energy of MX2 Number...