The thermal decomposition of gaseous Hydrogen Iodide () specifically on the solid surface of hot gold at high pressure is a classical textbook mechanism. What is the fundamental kinetic order of this

Question

The thermal decomposition of gaseous Hydrogen Iodide ($HI$) specifically on the solid surface of hot gold at high pressure is a classical textbook mechanism. What is the fundamental kinetic order of this surface reaction?

Prashant Kotian · Accepted Answer

Correct answer: A. At high initial pressures, the available active sites on the solid catalytic gold surface become entirely saturated with reactant molecules. Because the physical surface can accommodate no more reactant, adding further gas mass cannot alter the rate, locking the kinetics to a strictly constant Zero Order regime.

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