Copper reacts with sulfur to form copper sulfide. As shown in the equation 2CU + S yields CU2SA scientist adds 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 suffer react before running the experiment, the scientists expected the products of the reaction. To will be total of 15.9 g of copper sulfide CU2S in 1 to 2. Sentences explain the law that the scientist used to reject that the product of the reaction would be 15.9 g.
The scientist used the law of conservation of mass to reject that the product of the reaction would be 15.9 g of copper sulfide. According to this law, mass cannot be created or destroyed during a chemical reaction. Since the total mass of the reactants (12.7 g of copper + 3.2 g of sulfur = 15.9 g) is equal to the expected mass of the product, it indicates that all of the reactants have fully reacted to form the copper sulfide product.
The scientist used the Law of Conservation of Mass to reject the idea that the product of the reaction would be 15.9 g of copper sulfide (Cu2S).
The Law of Conservation of Mass states that in a chemical reaction, the total mass of the reactants must be equal to the total mass of the products. This means that matter cannot be created or destroyed during a chemical reaction, only rearranged.
In this case, the scientist added 12.7 g of copper (Cu) and 3.2 g of sulfur (S) as reactants. The predicted product mass of 15.9 g of copper sulfide would violate the Law of Conservation of Mass because it would imply that new matter has been created during the reaction.
Since the scientist expects that all of the copper and all of the sulfur react, the total mass of the reactants should be equal to the total mass of the products. Therefore, the scientist rejected the prediction of 15.9 g of copper sulfide as it would violate the Law of Conservation of Mass.
The scientist used the law of conservation of mass to reject that the product of the reaction would be 15.9 g. According to this law, mass is neither created nor destroyed during a chemical reaction, meaning that the total mass of the reactants must equal the total mass of the products.
In this case, the scientist started with 12.7 g of copper (CU) and 3.2 g of sulfur (S). According to the balanced equation, 2 moles of copper react with 1 mole of sulfur to form 1 mole of copper sulfide (CU2S).
To determine the expected mass of copper sulfide, we can calculate the molar masses. The molar mass of copper (Cu) is approximately 63.55 g/mol, sulfur (S) is approximately 32.07 g/mol, and copper sulfide (Cu2S) is approximately 159.17 g/mol.
Now, we can use the molar ratios to calculate the mass of copper sulfide that would be produced. From the balanced equation, we know that 2 moles of copper react with 1 mole of sulfur to form 1 mole of copper sulfide. This means that for every 63.55 g of copper, we would need 32.07 g of sulfur to form 159.17 g of copper sulfide.
Given that we have 12.7 g of copper, we can determine the corresponding mass of sulfur needed using stoichiometry. Using the ratio of 2 moles of copper to 1 mole of sulfur, we find that 12.7 g of copper requires (12.7 g Cu) * (1 mol Cu / 63.55 g Cu) * (1 mol S / 2 mol Cu) * (32.07 g S / 1 mol S) = 3.197 g of sulfur.
However, as per the given information, the scientist only added 3.2 g of sulfur. This means that there is not enough sulfur to completely react with all the copper in the reaction mixture. Therefore, the maximum amount of copper sulfide that could be formed is determined by the smaller reactant, which is 3.2 g of sulfur.
Based on the law of conservation of mass, the total mass of the products cannot exceed the mass of the limiting reactant, which in this case is sulfur. Hence, the scientist rejected the prediction that the product of the reaction would be 15.9 g of copper sulfide.