The decomposition of phosphine (PH_3) on tung | vedclass

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(A) The decomposition reaction is $PH_3 \xrightarrow{W} P + \frac{3}{2} H_2$.According to the Langmuir adsorption isotherm,the fraction of surface cov

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rate is proportional to the surface coverage

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(A) The decomposition reaction is $PH_3 \xrightarrow{W} P + \frac{3}{2} H_2$.According to the Langmuir adsorption isotherm,the fraction of surface coverage $	heta$ is given by $	heta = \frac{kP}{1 + kP}$.At low pressure,$kP \ll 1$,so $	heta \approx kP$.Since the rate of reaction is proportional to the surface coverage $(	ext{Rate} \propto 	heta)$,at low pressure,the rate becomes proportional to the partial pressure of $PH_3$ $(	ext{Rate} \propto P_{PH_3})$,which corresponds to a first-order reaction.

The decomposition of phosphine $(PH_3)$ on tungsten at low pressure is a first-order reaction. It is because the

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