For the reaction $H_{2} + I_{2} \rightarrow 2 HI$,provide the potential energy profile diagram and prove that it is an exothermic reaction.

(N/A) The potential energy profile diagram shows the energy change during the reaction.
From the graph,it is clear that the potential energy of the products $(E_{P})$ is less than the potential energy of the reactants $(E_{R})$.
Since $H_{P} < H_{R}$,the change in enthalpy is given by:
$\Delta H = (H_{P} - H_{R}) < 0$ (negative value).
Because energy is released during the process,the reaction is exothermic.