The irreversible gas-phase reaction A → B + C follows an elementary rate law and is to be carried out first in a PFR and then in a separate experiment in a CSTR. When pure A is fed to a 10 dm3 PFR at 300 K and a volumetric flow rate of 5 dm³/s, the conversion is 80%. When a mixture of 50% A and 50% inert (I) is fed to a 10 dm3 CSTR at 320 K and a volumetric flow rate of 5 dm³/s, the conversion is also 80%. What is the activation energy in cal/mol?