Chemistry · Chemical Kinetics · Free Energy & Chemical Equilibrium
Problem
The plot of log k_f versus 1/T for a reversible reaction A(g) ⇌ P(g) is shown. Pre-exponential factors for the forward and backward reactions are 10¹⁵ s⁻¹ and 10¹¹ s⁻¹, respectively. If the value of log K for the reaction at 500 K is 6, the value of |log k_b| at 250 K is ___. [K = equilibrium constant of the reaction; k_f = rate constant of forward reaction; k_b = rate constant of backward reaction]