A flask contains a mixture of compounds A and B

CHEMISTRY · Subjective · CBSE · Chemistry · Chemical Kinetics · Chemical Kinetics

Problem

A flask contains a mixture of compounds A and B. Both compounds decompose by first-order kinetics. The half-lives are 54.0 min54.0\,\text{min} for A and 18.0 min18.0\,\text{min} for B. If the concentrations of A and B are initially equal, how long, in minutes, will it take for the concentration of A to be four times that of B?

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