Answered: Question b) calculate deltaH for the…

Question b) calculate deltaH for the overall reaction using the following data for the indicated bond dissociation energies:

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter17: Alcohols And Phenols

Section17.SE: Something Extra

Problem 69AP: As a rule, axial alcohols oxidize somewhat faster than equatorial alcohols. Which would you expect...

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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

Question b) calculate deltaH for the overall reaction using the following data for the indicated bond dissociation energies:

1-'Brom
añe or
Lhe prouutts.
그
2
CH3CH2CHACHAB t HBr
CH 3CHCH2CH3
2-bromo buutane
Br
H-Br
b) Calculate AH° for the overall reaction using the following data for the indicated bond dissociation
energies:
CH, CH,-CH - CH,
AH° = 100 kcal/mol
H
CH, CH, CH, CH2
AH° = 105 kcal/mol
Br-Br AH° = 46 kcal/mol
CH, CH;-CH - CH,
AH° = 70 kcal/mol
Br
CH3CH2CH2어2
12 AH° = 74 kcal/mol
Br
H-Br AH° = 87.5 kcal/mol
c) Propose a step-by-step mechanism for the major product only.
2:Bro initiation Step
hv

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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