Question

Assertion (A): In a balanced chemical equation. The number of atoms present on the reactant side must always be equal to that of atoms present on the product side.Reason (R): A chemical equation is to be balanced in order to satisfy the law of conservation of mass.​

Answer 1

Explanation:

The law of conservation of mass states that mass can neither be created nor destroyed. Hence, in a chemical reaction, the total mass of reactants should be equal to the total mass of the products. It means that the total number of atoms of each element should be equal on both sides of a chemical equation.

Answer 2

Both assertion and reason are correct about balancing a chemical equation.

• The Law of conservation of mass was given by Antoine Lavoisier. He concluded from his discovery that no one can create or destruct a mass.
• The chemical reaction involves an interchange of already occurring atoms and hence results in yielding new products.
• Therefore, atoms on the reactants and products side will remain the same and thus balanced.