Question

Copper reacts with sulfur to form copper so far is shown in the equation. The scientist has 12.7 g of CU to 3.2 g 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 g of copper sulfide and one to two sentences explain the law that the scientist used to predict that the product of their action would be 15.9 g of copper sulfide.
GPT 3.5
The scientist used the Law of Conservation of Mass, which states that in a chemical reaction, matter is neither created nor destroyed. Therefore, the total mass of the reactants will be equal to the total mass of the products. In this case, the total mass of the copper and sulfur reactants (12.7g + 3.2g = 15.9g) is equal to the predicted mass of the copper sulfide product.