3. Solving a chemistry problem

15. When studying the reaction between ozone and carbon sulfide at a temperature of 29.3 C in the presence of an excess of CS2, the following experimental data were obtained:
t, min 0.0 0.5 1.0 2.0 3.0 4.0
PO3, Torr 1.76 1.04 0.79 0.52 0.37 0.29
Show that this reaction is second order with respect to ozone. Calculate the value of the apparent rate constant of the second order reaction.