Final answer:
The Law of Mass Action describes a system at equilibrium in terms of the concentrations of the products and the reactants. The equilibrium constant is used to express the constant ratio of product and reactant concentrations at equilibrium.
Step-by-step explanation:
The Law of Mass Action describes a system at equilibrium in terms of the concentrations of the products and the reactants. It states that the ratio of the concentrations of the products and reactants at equilibrium is constant, as long as the temperature remains the same. This can be expressed using the equilibrium constant, which is the product of the concentrations of the products raised to the power of their respective stoichiometric coefficients, divided by the product of the concentrations of the reactants raised to the power of their respective stoichiometric coefficients.