A reaction is 50% complete in 20 minutes. If it is first-order, how long will it take for 75% completion?
Q1. A reaction is 50% complete in 20 minutes. If it is first-order, how long will it take for 75% completion?
Answer: 40 min
Explanation: For a first-order reaction, 50% and 75% completion correspond to 1 and 2 half-lives, so 2 × 20 = 40 min.