Thus, the motor's behavior depends on both the equilibrium constant for the coupled reaction, which depends on ∆G rxn (the properties of the molecules) and the concentrations of the species involved, which do not; the term 𝑒 -∆G rxn RT ሾNEt 3 ሿሾFmocClሿ ሾNEt 3 HClሿሾCO 2 ሿሾ𝟓ሿ corresponds to the free energy change of the coupled reaction with its components chemostated from their equilibrium values. 13g It should also be obvious from the form of eq. 3a that the motor can display net flux (r0 ≠ 1) even if ∆G rxn = 0, depending on the concentrations of the species involved.