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For a particular first order reaction it takes 48 minutes for the concentration of the reactant to decrease to 25% of its initial value. What is the value for rate constant (in s-1) for the reaction? A) 6x10-3 s-1 B) 4.8x10-4 s-1 C) 1.0x10-4s-1 D) 2.9x10-2 s-1