A reaction proceeds by the sequence below at 298 K
CHEMISTRY · Single correct · AP · Chemistry · Kinetics · Kinetics
Problem
A reaction proceeds by the sequence below at 298 K.
Step 1 R → I₁ Ea = 65 kJ mol⁻¹
Step 2 I₁ → I₂ Ea = 25 kJ mol⁻¹
Step 3 I₂ → P Ea = 60 kJ mol⁻¹
The enthalpies of I₁ and I₂ relative to the reactants are +10 kJ mol⁻¹ and −5 kJ mol⁻¹, respectively. Which transition state corresponds to the overall activation energy for the reaction, and what is that overall activation energy?
(a) Transition state of Step 3; 60 kJ mol⁻¹
(b) Transition state of Step 2; 35 kJ mol⁻¹
(c) Transition state of Step 1; 65 kJ mol⁻¹
(d) Transition state of Step 3; 55 kJ mol⁻¹