The conversion of cyclopropane to propene in the gas phase is a first-order reaction with a half-life of 18 minutes at certain temperature. How long it will take (in minutes) for the concentration of cyclopropane to decrease from 0.25 M to 0.18 M at "this certain" temperature? Group of answer choices t = 8.38 minutes t = 8.53 minutes t = 8.65 minutes t = 8.86 minutes None of these

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