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Which statement is true regarding a chemical reaction

The total number of atoms changes, so mass is conserved in the reaction.

Even if the total number of atoms changes, mass may not be conserved in the reaction.

The total number of atoms does not change, so mass is conserved in the reaction.

Even if the total number of atoms does not change, mass may not be conserved in the reaction.

1 answer

The true statement regarding a chemical reaction is:

The total number of atoms does not change, so mass is conserved in the reaction.

This corresponds to the principle of conservation of mass, which states that in a closed system, the mass of the reactants must equal the mass of the products, meaning that the total number of atoms remains constant throughout the reaction.