The half-life of a reaction of compound A to give compounds D and E is 7.75 min when the initial concentration of A is 0.165 mol/L. (a) How long will it take (in min) for the concentration to drop to 0.0330 mol/L if the reaction is first order with respect to A?   min (b) How long will it take (in min) for the concentration to drop to 0.0330 mol/L if the reaction is second order with respect to A?

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