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Maksim231197 [3]
3 years ago
12

Calculate the Lattice Energy of KCl(s) given the following data using the Born-Haber cycle: ΔHsublimation K = 79.2 kJ/mol IE1 K

= 418.7 kJ/mol Bond EnergyCl–Cl = 242.8 kJ/mol EACl = 348 kJ/mol ΔHKCl(s) = –435.7 kJ/mol
Chemistry
1 answer:
DanielleElmas [232]3 years ago
3 0

Answer:

Explanation:

  The following equation relates to Born-Haber cycle

\triangle H_f = S + \frac{1}{2} B + IE_M - EA_X+ U_L

Where

\triangle H_f is enthalpy of formation

S is enthalpy of sublimation

B is bond enthalpy

IE_M is ionisation enthalpy of metal

EA_X is electron affinity of non metal atom

U_L is lattice energy

Substituting the given values we have

-435.7 = 79.2 + 1/2 x 242.8 + 418.7 - 348 +U_L

U_L = - 707 KJ / mol

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