In aqueous solution buffered at a pH of 6.75 Penicillin G (molecular weight of 334.39 g/mole) undergoes hydrolysis via a pseudo first order reaction that has an activation energy of 77.3 kJ/mole and a pseudo first order rate constant of 1.58 x 10-7 s-1 at 30°C. If a vial of Penicillin G containing 5,000,000 units is stored under the conditions above, how many days will it take for 10% of the drug to hydrolyze?

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