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Write equations for the chain propagation steps for the following reaction CH4 Br2CH3Br + HBr

2B. Use the bond dissociation enthalpy data in the given table to calculate ΔΗfor the reaction of methane with a bromine ato

KJ/mol 439 CH3-H 193 Br-Br H-Br 366

The activation energy for this reaction is 76 kJ/mol. Sketch a potential energy diagram for it, labeling reactants, product,

2D. Draw the structure of the transition state Does the transition state more closely resemble reactants or products? Give re

Write equations for the chain propagation steps for the following reaction CH4 Br2CH3Br + HBr
2B. Use the bond dissociation enthalpy data in the given table to calculate ΔΗ"for the reaction of methane with a bromine atom (radical).
KJ/mol 439 CH3-H 193 Br-Br H-Br 366
The activation energy for this reaction is 76 kJ/mol. Sketch a potential energy diagram for it, labeling reactants, product, and the transition state.
2D. Draw the structure of the transition state Does the transition state more closely resemble reactants or products? Give reasons
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Answer #1

Solution:

For the free radical bromination of methane completed in three steps:

Initiation, propagation and termination.

The propagation steps are:

CH4 + Cl• \rightarrow CH3• + HCl

CH3• + Cl2 \rightarrow CH3Cl + Cl•

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