Answered: measured by determining the wavelength…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter6: Covalent Bonding

Section: Chapter Questions

Problem 110QRT

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Question

Bond dissociation energies are often measured by determining the wavelength of ultraviolet photons needed to cause a covalent bond between two atoms to break. A single photon absorbed by a molecule will cause the bond to break between two atoms. If a bond dissociation energy is 450 kJ/mole, what wavelength of photon, in nm, will cause the bond to break?

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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