alleryUnits of rate constant k for a first-order reaction:
As⁻¹ (or min⁻¹)
Bmol L⁻¹ s⁻¹
CL mol⁻¹ s⁻¹
DDimensionless
Answer & Solution
Correct answer: A. s⁻¹ (or min⁻¹)
**For 1st order:** rate has units mol L⁻¹ s⁻¹, [A] has mol L⁻¹, so k has units s⁻¹ (inverse time).
**For 2nd order:** L mol⁻¹ s⁻¹.
**For zero order:** mol L⁻¹ s⁻¹.
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