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, matter cannot be created or destroyed, only transformed, so the total mass of reactants should be equal to the total mass of products.

Question

re-write

Answer 1

The scientist applied the Law of Conservation of Mass to forecast that the resulting outcome of the reaction would be 15.9 grams of copper sulfide. As per this law, matter cannot be generated or annihilated, but merely changed, implying that the cumulative mass of reactants must be equivalent to the cumulative mass of products.