First slide
Kinetics of chemical reactions
Question

If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately (in minutes)

Moderate
Solution

Use direct formulae:

tx%ty%=log100100xlog100100yt75%t60%=2log2log2.590t60%=2×0.30.4t60%=90×46=60min

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