An elementary irreversible gas-phase reaction, A → B + C, is carried out at fixed temperature and pressure in two separate ideal reactors: (i) a 10 m³ plug flow reactor (PFR), (ii) a 10 m³ continuous-stirred tank reactor (CSTR). If pure A is fed at 5 m³ h⁻¹ to the PFR operating at 400 K, the conversion is 80%. If a mixture of 50 mol% of A and 50 mol% of an inert is fed at 5 m³ h⁻¹ to the CSTR operating at 425 K, the conversion is 80%. The universal gas constant R = 8.314 J mol⁻¹ K⁻¹. Assuming the Arrhenius rate law, the estimated activation energy is __________ kJ mol⁻¹ (rounded off to one decimal place).