The concentration of a reactant in a first-order decomposition reaction is decreased to 1/8 of its original value in 100 s. What is the half-life of the reactant?

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Correct Answer: C. 33.3 s
You can test each of the answers: for 33.3 s intervals, the first 33.3 s finds the concentration dropping by 1/2, the next down to 1/4, the third down to 1/8, for a total of 100 s.
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