Answer:
The statement H is the correct one: The number of atoms on the reactant side equals the number of atoms on the product side.
Step-by-step explanation:
The law of conservation of mass states that mass can not be created or destroyed, just can be transformed. The mass of a system can not be added or removed, thereby the transfer of mass in a reaction must remain constant.
This implies that the mass of the molecules on the side of the reactants before the reaction must be equal to the mass of the atoms on the side of the products after the reaction.
Therefore, the statement H is the correct one: The number of atoms on the reactant side equals the number of atoms on the product side.
I hope it helps you!