AP Chemistrymediummcq1 pt
A first-order reaction has a half-life of 10 minutes. How long will it take for 75% of the reactant to decompose?
A.40 min
B.20 min
C.30 min
D.10 min
Explanation
Core Concept
For a first-order reaction, each half-life reduces the amount by half. After 10 min (1 half-life): 50% remains. After 20 min (2 half-lives): 25% remains, meaning 75% has decomposed.
Correct Answer
B20 min
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