Unit of KC in the reaction 2SO2 O2 ⇔ 2SO3 Equilibrium constant kc is defined as the ratio of the forward reaction rate constant to the reverse reaction rate constant. How do you write KC expressions? Kc units vary based on the concentrations of each reactant and product in the equation. It is also feasible thatWhat is the unit of KC in the reaction 2SO2 O2 ⇔ 2SO3?