Answer
Equilibrium constant$(K)$ ,for a chemical reaction present in equilibrium,is expressed by the concentrations of products raised to their stoichiometric coefficients divided by the concentrations of the reactants raised to their stoichiometric coefficients which is written by law of mass action.
Molarity is used toexpress concentration and equilibrium constant is denoted by $K_{c}$,whereas atmosphere is used to express partial pressure and equilibrium constant is denoted by $K_{p}$ .
Actually no unit is written for equilibrium constant $K_{p}$ and $K_{c}$ .Because equilibrium constant expression is the ratio of concentration or pressure to a reference concentration(exactly 1 M ) or a reference pressure(exactly 1 atm).
So when concentration units are expressed in molarity$K_{c}$ is written and when partial pressure units are expressed in atmosphere$K_{p}$ is used.
Work Step by Step
Conceptual question.No step by step work is required.
