Exhibit 13-18 Consider the Two-Step Mechanism Below That Has Been

question 116

Multiple Choice

Exhibit 13-18 Consider the two-step mechanism below that has been proposed for the gas phase reaction of H₂ with ICl to produce I₂ and HCl to answer the following problem(s) .
Step 1:
H₂ (g) + ICl (g) →HI (g) + HCl (g) (slow step)
Step 2:
HI (g) + ICl (g) →I₂ (g) + HCl (g) (fast step) Net reaction:
H₂ (g) + 2 ICl (g) →I₂ (g) + 2 HCl
-Refer to Exhibit 13-18. What is the molecularity of step 1 in this mechanism?

• A) unimolecular
• B) bimolecular
• C) trimolecular
• D) termolecular
• E) None of these

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