The decomposition of cyclopropane to propene is a unimolecular reaction. It can be studied over a range of pressures. The following data gives values of values of kit over a range of concentrations. Note: PV = nRT, hence pressure is proportional to concentration.

(a) Plot versus concentration and comment on the shape of the graph.

(b) From the data above, find [A]_1/2 and show this to equal k₂/k_-1.

(c) Find k₂ and then k₁ , taking Z=5x10¹⁰ mol^-1 dm³ s^-1 , and =1.

(d) Why can k_-1 be taken to equal a typical value of Z, the collision number?

104c mol dm -3 105 kl 1st obs 8-1 0.120 8.6 0.605 15.4 1.27 2.31 20.0 22.3 7.13 28.2 159 38.7