. (a) What is the rate constant for a second-order reaction with an initial reactant concentration of 0.300 mol/L if after 158 sec, the concentration is 0.200 mol/L?   (b)What is the half-life of this reaction?   2. What is the half-life in seconds for a second order reaction with the rate constant k = 2.74 x 10-1 L/mole∙s if the initial reactant concentration is 0.500 mol/L?

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