Bond energies

In a reaction, hydrogen reacts with chlorine according to:

$H_2(g) + Cl_2(g) \rightarrow 2HCl(g)$.

Using the bond energies: H–H = 436 kJ/mol, Cl–Cl = 243 kJ/mol, H–Cl = 431 kJ/mol, calculate the overall energy change, $\Delta H$, for the reaction.

(Take $\Delta H = \text{energy of bonds broken} - \text{energy of bonds formed}$.)