Question

what is the order of decomposition of ammonia on the surface of platinum catalysts? I give another example having the same order?

Answer 1

Answer: The order of decomposition of ammonia on the surface of platinum catalyst is zero.

$2NH_3\xrightarrow[1130K]{Pt}N_2+3H_2$

Explanation:

$2HI\xrightarrow[\Delta ]{Au}H_2+I_2$

Both the reactions follow zero order kinetics that means the rate is independent of the concentration of the reactants.

This is because at an instant one reactant which has occupied the surface on the catalyst will convert into product thus creating vacant sites for another reactant molecules to get adsorbed on the catalyst surface.Thus concentration of the reactant remains constant.