(a) What is the ratio of rate constants k_A/k_B at 25 °C for two reactions A and B if the standard free energy of activation of reaction A is 14 kJ mol^–1 (3.4 kcal mol^–1) less than that of reaction B?

(b) What is the difference in the standard free energies of activation at 25°C of two reactions A and B if reaction B is 450 times faster than reaction A? Which reaction has the greater ΔG°^‡?