The statement of the total mass after the reaction is "the same."
When one or more chemicals are transformed into one or more other compounds, a chemical reaction occurs.
A substance is something to do with mass that takes up space. The mass of a compound is the total amount of atoms present in grams that make up a molecule. The grams is the unit of mass.
The principle which implies that the mass of matter in a closed system will remain constant regardless of the type of change that occurs. The amount of mass will not change whether it is due to a change in condition, dissolving, a chemical reaction, or any combination of these. Because the number of each type of atom remains constant, the mass will remain constant.
Hence the correct answer is A.
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