At a certain temperature the rate of this reaction is second order in NH 3 with a rate constant of 6.38M 2NH3(g) → N2(g) + 3H2(g) -1 Suppose a vessel contains NH 3 at a concentration of 1.21M. Calculate the concentration of NH3 in the vessel 0.460 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits. м ☐ x10 ×

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