A first order reaction has k = 0.440 min-1 and the initial concentration of reactant is 0.840 M. What is the concentration of the reactant after 1.00 minute? A second order reaction has k = 7.35 X 10-3 M-1sec-1 and the initial concentration of reactant is 0.120 M. What is the concentration of the reactant after 10.0 minutes?