At a certain temperature this reaction follows first-order kinetics with a rate constant of 0.00285 s-1:
2Cl2O5 (g) → 2Cl2 (g) + 5O2 (g)
Suppose a vessel contains Cl2O5 at a concentration of 0.640 M. Calculate the concentration of Cl2O5 in the vessel 280. seconds later. You may assume no other reaction is important.
Round your answer to 2 significant digits.
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