Moises performs a chemical reaction according to the reaction below. If he started with 15.31 g of copper and 1.50 g of oxygen. Using the Law of Conservation of mass, what would be the mass of the product
be?
2Cu + 02 - 2 Cuo
A. 15.31 g
B. 16.89
C. 13.81 g
D. 1.5g

Explanation:

mass of the reactant = mass of the product

15.31 + 1.50 = 16.81g

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.