What is the unit of the rate constant of a first-order reaction?
Answer and explanation
Correct answer: B.
- Step 1: For a general reaction of overall order , the differential rate law is expressed as , where rate has units of .
- Step 2: Solving for the rate constant gives units of .
- Step 3: For a first-order reaction (), the concentration dependence cancels: , leaving the unit as .
Answer
.
Why not the others: is not a standard kinetic rate constant unit; is the rate constant unit for a second-order reaction (); is the unit of reaction rate itself or the rate constant of a zero-order reaction ().
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