For a certain first-order reaction, the time required to complete of the reaction () is related to the half-life () by which factor? ()

Answer and explanation

Correct answer: A.

  1. Step 1: For a first-order reaction: .
  2. Step 2: The half-life is .
  3. Step 3: Divide: . Thus .
Answer
.
Why not the others: corresponds to ; overestimates the time ratio; represents the mean lifetime .

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