Chemistry · Chemical Kinetics
A first-order reaction is half completed in 45 minutes. How long does it take for 99.9% of the reaction to be completed?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 120 hours
- 210 hours
- 37.5 hours✓
- 45 hours
Correct answer
7.5 hours
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