What is the number of total molecules on the left side of a balanced equation always equal to the number of total molecules on the right side of the equation?

In a balanced chemical equation, the total number of molecules on the left side is equal to the total number of molecules on the right side because of the law of conservation of mass. This principle states that matter cannot be created or destroyed in a chemical reaction; therefore, the quantity of reactants must equal the quantity of products. Balancing the equation ensures that the same number of each type of atom is present on both sides, which indirectly confirms that the total number of molecules is also balanced.