Lecture 12 Intermolecular Forces

About the discussion in the class:
CH₄ + Cl₂ --> CH₃Cl + HCl
ΔHrxn = ΔH(product bonds) + ΔH(reactant bonds)
ΔHrxn = ΔH(formed bonds) + ΔH(broken bonds)
Dissociation energies are given (+) then formation energies must be (-).
= - 770 kJ/mol + 657 kJ/mol = -114 kJ/mol

alternatively you can remember it by
ΔHrxn = ΔH(broken bonds) - ΔH(formed bonds)
= 657 kJ/mol - 770 kJ/mol = -114 kJ/mol

More info on this radical substitution reaction at chemgapedia.



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Reaction image: http://pslc.ws/mactest/nysyn.htm




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