t1/2=k0.693 Where t1/2 is the half-life in seconds (s), and k is the rate constant in inverse seconds (s1). Part A To calculate the half-life, plug the value for k into the half-life equation and solve. What is the half-life of a first-order reaction with a rate constant of 6.50104s1 ? Express your answer with the appropriate units. What is the rate constain of a frrst-order reaction that takes 378 seconds for the reactant concentraton to drop to half of its initial value? Express your answer with the appropriate units. Part C A certain fist.order reaction has a rate constart of 5.60103s1. How long will i take for the reactant concentration to drop to 31 of is initial value? Express your answer with the appropriate units