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At a certain temperature, this reaction follows first-order kinetics with a rate constant of 2.11 s-1. 2Cl2O5(g) → 2Cl2(g) + 5O2(g) Suppose a vessel containing Cl2O5 at a concentration of 1.00 M. Calculate the concentration of Cl2O5 in the vessel 0.520 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits.