Use the table to answer the question. Reaction CH4 + 4Cl2 → CCl4 + 4HCl Reactants Products Bonds Present 4 H–C 4 Cl–Cl 4 C–Cl 4 H–Cl Energy of Bonds Broken (Reactants) / Formed (Products) 4 × 411 kJ/mol 4 × 242 kJ/mol 4 × 327 kJ/mol 4 × 427 kJ/mol Which statement about the change in bond energy of this reaction is correct? (1 point) Responses The reaction is endothermic because the total bond energy of the reactants is greater than the total bond energy of the products. The reaction is endothermic because the total bond energy of the reactants is greater than the total bond energy of the products. The reaction is exothermic because the total bond energy of the reactants is less than the total bond energy of the products. The reaction is exothermic because the total bond energy of the reactants is less than the total bond energy of the products. The reaction is endothermic because the energy of each bond in the reactants is less than the energy of a bond in the products. The reaction is endothermic because the energy of each bond in the reactants is less than the energy of a bond in the products. The reaction is exothermic because the energy of each bond in the reactants is greater than the energy of a bond in the products.
The correct statement about the change in bond energy of this reaction is: The reaction is exothermic because the total bond energy of the reactants is less than the total bond energy of the products.
The correct statement about the change in bond energy of this reaction is: The reaction is exothermic because the total bond energy of the reactants is less than the total bond energy of the products.
To determine whether the reaction is endothermic or exothermic based on the change in bond energy, we need to compare the total bond energy of the reactants to the total bond energy of the products.
In this case, the total bond energy of the reactants is:
4 × 411 kJ/mol (H-C) + 4 × 242 kJ/mol (Cl-Cl) = 2468 kJ/mol
And the total bond energy of the products is:
4 × 327 kJ/mol (C-Cl) + 4 × 427 kJ/mol (H-Cl) = 2908 kJ/mol
If the total bond energy of the reactants is greater than the total bond energy of the products, it means that more energy was required to break the bonds in the reactants than was released when the new bonds formed in the products. Therefore, the reaction is endothermic.
Looking at the energy values we calculated, we can see that the total bond energy of the reactants (2468 kJ/mol) is less than the total bond energy of the products (2908 kJ/mol), so the correct statement is:
The reaction is exothermic because the total bond energy of the reactants is less than the total bond energy of the products.