In a balanced chemical reaction, the total mass of the products always equals the

mass of reactants

Explanation: According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

Reactants of a chemical reaction is defined as the substances which take part in a chemical reaction and undergoes a chemical change. Reactants are written on left side of the arrow.Products are defined as the substance which are formed at the end of the chemical reaction.Products are written on the right side of the arrow.

For Example:

Mass of Carbon = 12 g

Mas of Oxygen = 32 g

Mass of Carbon dioxide = 12+2(16)= 44 g

Thus mass of products is equal to mass of reactants in a balanced chemical equation.