A reaction that proceeds 80 % to completion in 10 min at 30 °C is cooled to 10 °C

CHEMISTRY · Single correct · A Level · Chemistry · Kinetics · Kinetics

Problem

A reaction that proceeds 80 % to completion in 10 min at 30 °C is cooled to 10 °C. Assuming the rule of thumb that the rate halves for every 10 °C decrease, approximately how long will the cooled reaction need to reach the same 80 % completion? (a) About 20 min20\,\text{min} (b) About 80 min80\,\text{min} (c) About 40 min40\,\text{min} (d) About 5 min5\,\text{min}

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