Ch ical chemistr Reaction Kinetic Reversible first-Order reactions aA+bB+…→>eE+fF+ (171) Consider the reverse reaction(opposing reaction) A>C the first order in both forward and back directions rh= kb kfla da nh= kbl4 Physical Chemistry Reversible First-Order Reactions Consider the reverse reaction (opposing reaction) r k [A] f = f A C f k ⎯→ kb aA+ bB +→ eE + fF + (17.1) the first order in both forward and back directions r k [C] b = b [ ] [ ] r k A dt d A f f f  = =      − [ ] [ ] r k C dt d A b b b  = =      Reaction Kinetics