At 298 K, the standard free-energy changes for three reactions are:
Reaction A: −40 kJ mol⁻¹
Reaction B: −37 kJ mol⁻¹
Reaction C: +12 kJ mol⁻¹
Using R = 8.314 J mol⁻¹ K⁻¹, rank the equilibrium constants of these reactions from largest to smallest and estimate the value of K for each to the nearest power of ten.