At a certain temperature this reaction follows first-order kinetics with a rate constant of 0.00138 s: 2N₂O5 (g) → 2N₂O4 (8) +0₂ (8) Suppose a vessel contains N₂O5 at a concentration of 1.21 M. Calculate the concentration of N₂O5 in the vessel 620. seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits. M

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