Multiple Choice
A mechanism for a naturally occurring reaction that destroys ozone is given by the following steps:Step 1: O3(g) + HO(g) → HO2(g) + O2(g)Step 2: HO2(g) + O(g) → HO(g) + O2(g)What is the molecularity of the overall reaction?
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15. Chemical Kinetics
Reaction Mechanism
Multiple Choice
In a proposed reaction mechanism, the rate-determining step involves the collision of two reactant molecules: NO and O2. What is the molecularity of the rate-determining step?
A
Termolecular
B
Zero molecular
C
Unimolecular
D
Bimolecular
Verified step by step guidance1
Understand that molecularity refers to the number of reactant molecules involved in an elementary step of a reaction mechanism.
Identify the reactant molecules involved in the rate-determining step; here, it involves NO and O\_2 molecules colliding.
Since two reactant molecules are involved in this step, the molecularity is the number of molecules participating, which is two.
Recall the definitions: unimolecular involves one molecule, bimolecular involves two molecules, and termolecular involves three molecules colliding simultaneously.
Conclude that because two molecules (NO and O\_2) collide in the rate-determining step, the molecularity is bimolecular.
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