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If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately

1. 45 minutes
2. 60 minutes
3. 40 minutes
4. 50 minutes

Correct answer: 60 minutes

Solution

For a first-order reaction, the half-life is constant and independent of the initial concentration. Since 50% completion corresponds to one half-life, and 60% completion in 60 minutes implies the half-life is approximately 60 minutes, the time for 50% completion is also 60 minutes.

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