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At a certain temperature this reaction follows first-order kinetics with a rate constant of 0.0123 s^-1: 2Cl2O5(g) -> 2Cl2(g) + 5O2(g) Suppose a vessel contains Cl2O5 at a concentration of 1.39 M. Calculate the concentration of Cl2O5 in the vessel 99.0 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits.