At a certain temperature this reaction follows second-order kinetics with a rate constant of ·0.12M−1:s−1 →2Cl2O5g+2Cl2g5O2g Suppose a vessel contains Cl2O5 at a concentration of 1.29M . Calculate the concentration of Cl2O5 in the vessel 77.0 seconds later. You may assume no other reaction is important. Round your answer to 2  significant digits.

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