The following mechanism has been proposed for the gas- phase reaction of chloroform (CHCI3) and chlorine: k1 Step 1: Cl2(g) 2 Cl(g) (fast) k - 1 k2 Step 2: Cl(g) + CHC1,(g) HCl(g) + CCl,(8) (slow) k3 Step 3: Cl(g) + CC13(g) CCl4 (fast) (a) What is the overall reaction? (b) What are the inter- mediates in the mechanism? (c) What is the molecularity of each of the elementary reactions? (d) What is the rate- determining step? (e) What is the rate law predicted by this mechanism? (Hint: The overall reaction order is not an integer.)

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Q 4-3:
The following mechanism has been proposed for the gas-
phase reaction of chloroform (CHC13) and chlorine:
k1
Step 1: Cl2(g) = 2 CI(g) (fast)
k -1
Step 2: Cl(g) + CHCI3(g)
k2
HCI(g) + CCI3(8) (slow)
k3
Step 3: Cl(g) + CCl;(g) –→
CCl4 (fast)
(a) What is the overall reaction? (b) What are the inter-
mediates in the mechanism? (c) What is the molecularity
of each of the elementary reactions? (d) What is the rate-
determining step? (e) What is the rate law predicted by
this mechanism? (Hint: The overall reaction order is not
an integer.)
Transcribed Image Text:Q 4-3: The following mechanism has been proposed for the gas- phase reaction of chloroform (CHC13) and chlorine: k1 Step 1: Cl2(g) = 2 CI(g) (fast) k -1 Step 2: Cl(g) + CHCI3(g) k2 HCI(g) + CCI3(8) (slow) k3 Step 3: Cl(g) + CCl;(g) –→ CCl4 (fast) (a) What is the overall reaction? (b) What are the inter- mediates in the mechanism? (c) What is the molecularity of each of the elementary reactions? (d) What is the rate- determining step? (e) What is the rate law predicted by this mechanism? (Hint: The overall reaction order is not an integer.)
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