At a certain temperature this reaction follows second-order kinetics with a rate constant of 0.0618 M 2NH3 (g) → N₂ (g) + 3H₂(g) Suppose a vessel contains NH3 at a concentration of 1.25 M. Calculate the concentration of NH3 in the vessel 68.0 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits. OM S ? 0.9 X

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