The reaction between hydrogen and chlorine to form hydrogen chloride can be written as:
H2(g) + Cl2(g) ===> 2HCl(g)
Use the bond energies shown to calculate the energy change that takes place when hydrogen chloride is formed according to the above equation.
(Bond energies in kJ/mol: H-H 435, Cl-Cl 245, H-Cl 430)