At 300 K, a reaction takes 2 hours to complete 50% of the way, but at 320 K, it takes 30 minutes. If the reaction is a fırst order reaction, find the pre-exponential factor. 3.38x10^7 min^-1 2.48x10^7 min^-1 4.48x10^6 min^-1 1.36x10^7 min^-1

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