At a certain temperature the rate of this reaction is second order in HI with a rate constant of 1.0M 2HI (g) → H₂(g) + 1₂ (8) - Suppose a vessel contains HI at a concentration of 1.33 M. Calculate the concentration of HI in the vessel 7.50 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits. M X S

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