075. Solving a chemistry problem

4. Find the order and rate constant of the reaction of gas-phase decomposition of tert-butyl peroxide (decomposition products – ethane and acetone in a ratio of 1:2) using kinetic data:
t, min 0 3 6 12 15 18 21 y
p/kPa 23.1 25.9 28.2 32.6 34.6 36.5 38.2 69.4