Problem: The reaction: 2HI → H2 + I2, is second order and the rate constant at 800 K is 2.162 M -1 s-1. How long will it take for 3.185 mol/L of HI to decrease to one-fourth of its initial concentration? 

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The reaction: 2HI → H+ I2, is second order and the rate constant at 800 K is 2.162 M -1 s-1. How long will it take for 3.185 mol/L of HI to decrease to one-fourth of its initial concentration? 

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