A first-order reaction has a rate constant of . What is the half-life () of the reaction?

Answer and explanation

Correct answer: C.

  1. Step 1: Recall the half-life formula for a first-order reaction: .
  2. Step 2: Substitute .
  3. Step 3: Calculate: .
Answer
.
Why not the others: divides the true half-life by 2; is an arithmetic estimation error; multiplies by 1.5.

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