To determine the mass of the reactants based on the given mass of the products, we can use the Law of Conservation of Mass. This fundamental principle in chemistry states that mass is neither created nor destroyed in a chemical reaction. Therefore, the total mass of the reactants must equal the total mass of the products.
Given:
- Mass of the products = 120 g
According to the Law of Conservation of Mass:
- Mass of the reactants = Mass of the products
Therefore, the mass of the reactants would also be:
- Mass of the reactants = 120 g
So, the correct answer is:
- 120 g
