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## Homework Statement

The kinetics of the decomposition of phosphine at 950 K

4PH3 (g) -> P4 (g) + 6H2 (g)

was studied by injecting PH3(g) into a reaction vessel and measuring the total pressure at constant volume.

P total (Torr) Time (s)

100 0

150 40

167 80

172 120

What is the rate constant of this reaction?

## Homework Equations

PV = nRT

rate = k[PH3] ^n

## The Attempt at a Solution

Do I need to find the reaction order with respect to PH3 before finding the rate constant? I am lost.