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In a study of the decomposition of ammonia on a platinum surface at 856 °C NH3 → 1/2 N2 + 3/2 H2 the following data were obtained: The observed half life for this reaction when the starting concentration is 1.41x10^-2 M is _______ s and when the starting concentration is 7.05x10^-3 M is ______ s.