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For the decomposition of ammonia on a platinum surface at 856 degrees C 2 NH3 → N2 + 3 H2 the average rate of disappearance of NH3 over the time period from t = 0 s to t = 5973 s is found to be 1.50x10^-6 M s^-1. The average rate of formation of H2 over the same period is ____ M s^-1.