Answered: You are given the following Born-Haber…

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter12: The Solid State

Section: Chapter Questions

Problem 50GQ: Using the thermochemical data below and an estimated value of 2481 kJ/mol for the lattice energy for...

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You are given the following Born-Haber cycle information. Based on the values listed, determine the lattice energy for MgO.

Enthalpy of formation for magnesium oxide: -602 kJ/mol

Enthalpy of sublimation for magnesium: 150 kJ/mol

First ionization energy for magnesium: 738 kJ/mol

Second ionization energy for magnesium: 1451 kJ/mol

Bond dissociation energy for molecular oxygen: 498 kJ/mol

First electron affinity for oxygen: -141 kJ/mol

Second electron affinity for oxygen: 878 kJ/mol

Formula Formula Bond dissociation energy (BDE) is the energy required to break a bond, making it an endothermic process. BDE is calculated for a particular bond and therefore consists of fragments such as radicals since it undergoes homolytic bond cleavage. For the homolysis of a X-Y molecule, the energy of bond dissociation is calculated as the difference in the total enthalpy of formation for the reactants and products. X-Y → X + Y BDE = Δ H f X + Δ H f Y – Δ H f X-Y where, ΔHf is the heat of formation.

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