The decomposition of nitrous oxide at 565C N2O(g)N2(g)+1/2O2(g) is second order in N2O with a rate constant of 1.10E3M1s1. If the initial concentration of N2O is 1.31M, the concentration of N2O will be M after 2.59E+3 seconds have passed. The decomposition of ammonia on a platinum surface at 856C NH31/2N2+3/2H2 is zero order in NH3 with a rate constant of 1.50E-6 Ms1. If the initial concentration of NH3 is 4.65E3M, the concentration of NH3 will be 7.35E4M after seconds have passed