Cyclopropane isomerizes into propene when heated to 500°c in the gas phase. the extent of conversion for various initial pressures has been followed by gas chromatography by allowing the reaction to proceed for a time with various initial pressures where p0 is the initial pressure and pis the final pressure of cyclopropane.

p0/torr 200 200 400 400 600 600
t/s 100 200 100 200 100 200
p/torr 186 173 373 347 559 520

what is the order and the rate constant for the reaction under these conditions?