Hydrogen Iodide Decomposes at 800 K Via a Second-Order Process

question 126

Multiple Choice

Hydrogen iodide decomposes at 800 K via a second-order process to produce hydrogen and iodine according to the following chemical equation: 2HI(g) → H₂(g) + I₂(g)
At 800 K it takes 142 seconds for the initial concentration of HI to decrease from 6.75 × 10^-2 mol L^-1 to 3.50 × 10^-2 mol L^-1. What is the rate constant for the reaction at this temperature?

• A)5.12 × 10^-4 L mol^-1 s^-1
• B)9.69 × 10^-2 L mol^-1 s^-1
• C)10.3 L mol^-1 s^-1
• D)1.95 × 10³ L mol^-1 s^-1

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