The following reaction C2H5NO2 + OH- → CH3CH=NO2 + H2O is the second order reaction in terms of nitroethane (reagent). The constant for this reaction at 273 K is 0.652 mol-1 L s -1 . The initial concentration of nitroethane is 0.004 mol/L. How long takes the reduction the reactant concentration to 0.0004 mol/L.