Some is introduced into a flask at containing an inert gas

CHEMISTRY · Subjective · A Level · Chemistry · Rate equations · Rate equations

Problem

Some PH3(g)\text{PH}_3(\text{g}) is introduced into a flask at 600∘C600^\circ\text{C} containing an inert gas. PH3\text{PH}_3 proceeds to decompose into P4(g)\text{P}_4(\text{g}) and H2(g)\text{H}_2(\text{g}) and the reaction goes to completion. The total pressure is given below as a function of time. Find the order of the reaction and calculate the rate constant.
Time (sec.)060120∞\infty
P (mm Hg)262.40272.90275.51276.40

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