Final answer:
The mass of the final product after mixing Chemical X (5g) with Chemical Y (10g) and undergoing a chemical reaction is 15 grams, due to the Law of Conservation of Mass, which states that mass is conserved in a chemical reaction.
Step-by-step explanation:
When mixing Chemical X with a mass of 5 grams and Chemical Y with a mass of 10 grams, and a chemical reaction occurs, the mass of the final product, according to the Law of Conservation of Mass, is simply the sum of the masses of the reactants. So, the mass of the final product would be 5 g + 10 g = 15 grams. This is because the Law of Conservation of Mass states that mass cannot be created or destroyed in a chemical reaction, thus the mass of the products must equal the mass of the reactants.