At a certain temperature the rate of this reaction is first order in HI with a rate constant of 4.5 s 2HI (g) - → H2 (g) +I2 (g) Suppose a vessel contains HI at a concentration of 0.510 M. Calculate how long it takes for the concentration of HI to decrease by 94.%. You may assume no other reaction is important. Round your answer to 2 significant digits.

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