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, mass is neither created nor destroyed in a chemical reaction, so the total mass of the reactants should equal the total mass of the products.
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The law of conservation of mass is a fundamental principle in chemistry that states that mass cannot be created or destroyed during a chemical reaction. In other words, the total mass of the reactants (substances that are being combined or broken down) must be equal to the total mass of the products (new substances that are formed).
Using this law, the scientist was able to predict that the reaction would produce 15.9 grams of copper sulfide. This prediction was based on careful measurements and calculations, taking into account the mass of the reactants and the stoichiometry (the ratio of the reactants and products) of the reaction.
By applying the law of conservation of mass, the scientist was able to confidently state that no mass would be lost or gained during the reaction. This principle is essential for accurately balancing chemical equations and understanding the overall composition of a reaction.
Overall, the law of conservation of mass is a critical concept that allows scientists to make predictions about the outcome of chemical reactions and ensures that mass is conserved throughout the process. It is one of the fundamental principles that underpin our understanding of the physical and chemical world.