A first-order reaction is 20% complete in 10 minutes. What is the rate constant?

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0.0223 min⁻¹ Correct 0.0346 min⁻¹ 0.0154 min⁻¹ 0.0462 min⁻¹

k = (2.303/10) log(1/0.8) = (2.303×0.0969)/10 ≈ 0.0223 min⁻¹.

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