The industrial synthesis of hydrogen chloride gas from its constituent elements, hydrogen and chlorine, is a highly exothermic reaction:
H2(g)+Cl2(g)→2HCl(g) \text{H}_2(\text{g}) + \text{Cl}_2(\text{g}) \rightarrow 2\text{HCl}(\text{g}) H2(g)+Cl2(g)→2HCl(g)Explain, in terms of bond breaking and bond making, why this reaction is exothermic.
