Answered: H2 has equilibrium bond length of 0.751…

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

Chapter8: Bonding And Molecular Structure

Section8.9: Bond Properties: Order, Length, And Dissociation Enthalpy

Problem 3RC: 3. Use bond dissociation enthalpies to estimate the enthalpy change for the decomposition of...

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Question

H₂ has equilibrium bond length of 0.751 Å and bond dissociation energy of 432 kJ mol21
, whereas F₂ has equilibrium bond length of 1.417 Å and bond dissociation energy
of 155 kJ mol21
. On the same graph show qualitative
sketches of the effective potential energy curve Veff for an
H₂ and an F₂ molecule. In your solution, show the conversion from kJ mol21
to the energy of a single molecule.
1

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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