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2Cu+S→Cu2S

Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction. In this reaction, all of the copper and all of the sulfur react. Before running the experiment, the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S). In 1–2 sentences, explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide.

Well, the law that the scientist used is none other than the Law of Conservation of Mass. According to this law, mass cannot be created or destroyed in a chemical reaction. So, if all the reactants are consumed, the total mass of the products should be equal to the total mass of the reactants.

The scientist used the law of conservation of mass to predict that the product of the reaction would be 15.9 grams of copper sulfide. This law states that matter cannot be created or destroyed in a chemical reaction, so the total mass of the reactants should be equal to the total mass of the products.

The scientist used the law of conservation of mass to predict that the product of the reaction would be 15.9 grams of copper sulfide. According to this law, the mass of the reactants should be equal to the mass of the products in a chemical reaction.