Define equilibrium constant of a reaction.What is the unit of equilibrium constant.

Explanation

Equilibrium constnat `(K_(c)` is defined as the ratioi of product of equilibrium concentrations of products to the product of equilibrium concentrations of reactants each concentration term being raised to its stoichiometric coefficient.
Consider the following reaction at equilibrium.
`aA+bBhArrcC+dD`
Applying law of mass action
`R_(f) prop [A]^(b)[B]^(b)" "R_(f)=K_(f)[A]^(a)[B]^(b)`
`R_(b)prop[C]^(c)[D]^(d)" "R_(b)=K_(b)[C]^(c)[D]^(4)`
At equilibrium `R_(f)=R_(b)`
`K_(f)[A]^(a)[B]^(b)=K_(b)[C]^(c)[D]^(d)`
`K_(C)=(K_(f))/(K_(b))=([C]^(c)[D]^(d))/([A]^(a)[B]^(b))`