Please answer all sub-questions. Thank you.

Problem B The following gas phase reaction was studied in an isothermal batch reactor held at 300C. NO2NO+0.5O2 The total pressure in the reactor as a function of time was measured for initial partial pressure NO2=5 bar. The tabulated data are reported below. (a) Is the reaction first order in the concentration of NO2 ? (b) What is the rate constant based on the data given? (Hint: Assume it is first order and try to prove or disprove your hypothesis)