The integrated rate law allows chemists to predict the reactant concentration after a certain amount of time, or the time it would take for a certain concentration to be reached. The integrated rate law for a first-order reaction is: [A] = [A]oe-kt Now say we are particularly interested in the time it would take for the concentration to become one-half of its initial value. Then we [A]. could substitute for [A] and rearrange the equation to: 2 t1/2 = 0.693 k This equation calculates the time required for the reactant concentration to drop to half its initial value. In other words, it calculates the half-life. v Part C A certain first-order reaction has a rate constant of 6.50x10-s-How long will it take for the reactant concentration to drop to of its initial valuo? Express your answer with the appropriate units. View Available Hint(s) HA ? Value Units Submit Request