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The decomposition of ammonia on a tungsten surface at 1100 degrees C. NH3 → 1/2 N2 + 3/2 H2 is zero order in NH3 in one experiment, when the initial concentration of NH3 was 1.78x10^-3 M, the concentration of NH3 dropped to 3.22x10^-4 M after 288 seconds had passed. Based on these data, the rate constant for the reaction is ____ M s^-1.