Order And Molecularity
The unit of the rate constant for a second-order reaction is:
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About This Question
- Subject
- chemistry
- Chapter
- chemical kinetics
- Topic
- order and molecularity
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
L mol⁻¹ s⁻¹
For a reaction of order n, the unit of rate constant k is derived from: rate = k[A]ⁿ. Since rate has units of mol L⁻¹ s⁻¹ and [A]ⁿ has units of (mol L⁻¹)ⁿ, the unit of k = (mol L⁻¹ s⁻¹) / (mol L⁻¹)ⁿ = (mol L⁻¹)^(1−n) s⁻¹. For n = 2: unit = (mol L⁻¹)^(−1) s⁻¹ = L mol⁻¹ s⁻¹.
This easy difficulty chemistry question is from the chapter chemical kinetics, covering the topic of order and molecularity. It appeared in the 2025 exam.
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