A reaction pathway diagram is shown for the catalysed and uncatalysed reactions between $\text{N}_2$ and $\text{H}_2$: $\text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g)$. Which letter shows the activation energy for the first step in the decomposition of $\text{NH}_3$ in the presence of a catalyst?
Chemistry 9701 · AS & A Level · Reaction kinetics