The decomposition of dimethy ether is first order with respect C2H6O. The rate constant for the decomposition is 3.2x10^-4 s-1 at 450 C. A container is filled with C2H6O until its concentration reaches 1.375 mol. How many minutes will it take for 71.5 percent of the C2H6O break down?

The reaction A --> B + C is 2nd order with respect to reactant A and second order overall. The rate constant for the reaction is 0.0250 L/mol per min. If the initial concentration of reactant A is 0.455 mol/L, how long (in hours) will it take for 60.0 percent of material A to react?