At 25degc hydrogen iodide breaks down very slowly to, Ask an Expert

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At 25°C, hydrogen iodide breaks down very slowly to hydrogen and iodine: rate=k[HI]2. The rate constant at 25°C is 2.4 10-21 L/mol·s. If 0.0165 mol of HI(g) is placed in a 1.0 L container, how long will it take for the concentration of HI to reach 0.0084?

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