The photochemical radical synthesis of hydrogen chloride gas, , is universally known to rigorously follow which specific macroscopic kinetic reaction order?

Question

The photochemical radical synthesis of hydrogen chloride gas, $H_2(g) + Cl_2(g) \xrightarrow{h
u} 2HCl(g)$, is universally known to rigorously follow which specific macroscopic kinetic reaction order?

Prashant Kotian · Accepted Answer

Correct answer: A. Because the massive activation energy barrier is entirely overcome by the external absorption of high-energy photons rather than thermal collisions, the overall rate of product generation becomes purely dependent on incoming light intensity, becoming entirely independent of reactant concentration (Zero Order).

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