The law of reaction rate: 2 N2O => 2N2 (g) + O2 (g) is of order two with respect to N2O. The reaction carried out at 900K with an initial concentration of N2O equal to 2 × 10 ^ -2 mol / L. It took 4500 seconds for N2O to drop to half of its initial concentration. Calculate: The time required for N2O to decompose to 90% of its initial concentration.