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