Given the reaction coordinate diagram below and the following reaction mechanism

ID: 104394 • Letter: G

Question

Given the reaction coordinate diagram below and the following reaction mechanism:

Step 1: CH4 + Cl• --> •CH3 + HCl H = +4 kJ Ea = 17 kJ

Step 2: •CH3 + Cl2 --> CH3Cl + Cl• H = +-109 kJ Ea = 4 kJ

Select all the appropriate answers describing products, intermediates, overall energy, and activation energy.

a) The overall energy = -105 kJ

b) The overall energy = -113 kJ

c) Products of the reaction = HCl and Cl2

d) Products of the reaction = Cl• and •CH3

e) Intermediate of the reaction = •CH3

f) Intermediates of the reaction = HCl and •CH3

g) Activation energy of the reaction = The first step is the rate determining (rate limiting) step

h) Activation energy of the reaction = The first step is the rate determining (rate limiting) step

AIF reaction coordinate-

delta H overall = 4 KJ + (-109 KJ) = -105 KJ

a is correct and b is wrong

add both steps to get overall reaction

CH4 + Cl2 —> HCl + CH3Cl

product is CH3Cl and HCl

c and d are wrong

intermediate is .CH3

e is correct and f is wrong

activation energy is more for 1st step

So, 1st step is rate determining step

both g and h are same. If they are same both are correct

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