At a certain temperature the rate of this reaction is second order in NH, with a rate constant of 22.3 M¯'s: 2NH, (g) → N, (g) +3H, (g) Suppose a vessel contains NH, at a concentration of 1.29M. Calculate how long it takes for the concentration of NH, to decrease to 0.310M. You may assume no other reaction is important. Round your answer to 2 significant digits.

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