answer should be 2.822

The reaction rate is evaluated in a bench top plug flow reactor, which operates at a temperature of 320C, pressure of 25atm. The feed flowrate of pure A is 3.5m3h1, the catalyst mass in the reactor is 3kg and the conversion of A at the outlet is 0.8 . Calculate the value of the first order rate constant. rA=kPA where rA is reaction rate, k is first order rate constant and PA is partial pressure of A