Use the information in the table to answer the question. Bond Bond Energy (kJ/mol) H–Cl 427 Cl–Cl 242 H–H 435 Hydrogen and chlorine gases react to produce hydrochloric acid according to the reaction. H2 + Cl2 → 2HCl How much total bond energy, in kJ/mol, is in the products of the reaction?

Question

677 854 427 435
pick an option

Answer 1

The equation H2 + Cl2 → 2HCl shows that two moles of HCl are formed from one mole each of H2 and Cl2.

To find the total bond energy in the products, we need to sum up the bond energies of all the bonds broken and formed.

In the reactants (H2 and Cl2), we have two H-H bonds and one Cl-Cl bond.
Bond energy for H-H bond = 435 kJ/mol
Bond energy for Cl-Cl bond = 242 kJ/mol

In the products (2HCl), we have two H-Cl bonds.
Bond energy for H-Cl bond = 427 kJ/mol

Total bond energy in the products = 2 * (bond energy of H-Cl bond) = 2 * 427 kJ/mol = 854 kJ/mol

Therefore, the correct option is 854 kJ/mol.