The activation energy of exothermic reaction A B is 80 ~kJ ~mol ⁻¹ . The heat of reaction is 200 ~kJ ~mol ⁻¹ . The activation energy for the reaction B A (in kJ mol ⁻¹ ) will be

Step-by-step solution

E_a(A B)=80 ~kJ ~mol ⁻¹ Heat of reaction (A B)=200 ~kJ ~mol ⁻¹ For (B A) backward reaction, aligned E_a(B A) & =E_a(A B)+ heat of reaction & =80+200=280 ~kJ ~mol ⁻¹ aligned