Question
What are the units of equilibrium constant (Kc)?
Solution
The units of Kc vary from reaction to reaction.
(i) Kc has no units when there is no change in a number of moles in a reaction.
i.e. it is unitless.
(ii) Kc has units when the number of moles in the reaction differs, e.g.
Thus,
will have the units 
(i) Kc has no units when there is no change in a number of moles in a reaction.
i.e. it is unitless.
(ii) Kc has units when the number of moles in the reaction differs, e.g.
Thus,
will have the units
