Which of the following picture illustrates the Law of Conservation of Matter?

The correct answer is:

• In chemistry, the law of mass action is the statement that the rate of a chemical reaction is directly proportional to the product of the activities or concentrations of the reactants. It describes and predicts the behavior of solutions in dynamic equilibrium.
• In particular, this means that in a chemical reaction mixture at equilibrium, the ratio of reactant and product concentrations is constant.