If for, `AtoB" "DeltaH=+q` CAL then for, `BtoA" "DeltaH=-q` cal If for, `AhArrB` eqb. CONSTANT = K then for, `BhArrA` eqb. Constant = `1/K` If for, `AtoB` RATE constant = k then for, `BtoA` rate constant `nek` If for, `AtoB` energy of ACTIVATION = E then for, `BtoA` energy of activation = -E.