The decomposition of ammonia on a platinum surface at 856C NH31/2N2+3/2H2 is zero order in NH3 with a rate constant of 1.50106M/s. If the initial concentration of NH3 is 1.01102M, the concentration of NH3 will be 2.62103M after have passed. The gas phase decomposition of nitrogen dioxide at 383C NO2(g)NO(g)+12O2(g) is second order in NO2. In one experiment, when the initial concentration of NO2 was 0.226M, the concentration of NO2 dropped to 4.43102M2 after 21.7 seconds had passed. Based on these data, the rate constant for the reaction is