Question

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 M to 3.50 10-2 M. What is the rate constant for the reaction at this temperature?
A) 5.12 10-4 M-1s-1
B) 9.69 10-2 M-1s-1
C) 10.3 M-1s-1
D) 1.95 103 M-1s-1

Answer

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