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A first-order reaction is 15% completed in 20 minutes. How long will it take to complete 60% of the reaction?

a) 40 minutes
b) 60 minutes
c) 80 minutes
d) 120 minutes

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.

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