State and explain the Law of Mass Action.

Explanation

**Step-by-Step Solution:**

1. **Definition of the Law of Mass Action**: The Law of Mass Action states that the rate of a chemical reaction is directly proportional to the product of the concentrations of the reactants, each raised to the power of their respective stoichiometric coefficients.

2. **Application in Equilibrium**: At equilibrium, the ratio of the concentrations of the products to the concentrations of the reactants remains constant. This is crucial in understanding chemical equilibrium.

3. **Equilibrium Constant (Kc)**: For a general reversible reaction represented as:
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