Everything else being equal, write a general expression showing how the exchange current density for a reaction changes as a function of temperature [e. g., write an expression for j0 (t) at an arbitrary temperature t as a function of j0 (t0) at a reference temperature t0]. if a reaction has j0 = 10−8a∕cm2 at 300 k and j0 = 10−4a∕cm2 at 600 k, what is δg‡ for the reaction? assume that the preexponent portion of j0 is temperature independent.