Answer :
Final answer:
The correct answer is: d) 120 minutes. Explanation on the time required to complete 60% of a first-order reaction given initial completion percentage and time elapsed.
Explanation:
The correct answer is: d) 120 minutes. The completion of a first-order reaction can be analyzed using the concept of half-life. In this case, we are given that the reaction is 15% completed in 20 minutes. To determine the time it takes to complete 60% of the reaction, we can use the fact that each half-life represents a 50% reduction in reactant concentration.
