Question

The equilibrium constant has no unit if $\Delta n=................$

Answer 1

The Equilibrium constant expression involves the concentrations or partial pressures of the reactants and products.

The units of Equilibrium constant $K$ will depend on the number of moles of reactants and products. When the total number of moles of products is equal to the total number of moles of reactants $(\Delta n=0)$, then $K$ has no units.