When the reaction between hydrogen and iodine has reached equilibrium at $400^\circ\text{C}$, the reaction is exothermic. $\text{H}_2(g) + \text{I}_2(g) \rightleftharpoons 2\text{HI}(g) \qquad \Delta H = -13\,\text{kJ mol}^{-1}$ Which change in conditions would increase the percentage of hydrogen iodide in the equilibrium mixture?
- Aa decrease in pressure
- Ba decrease in temperature
- Can increase in pressure
- Dan increase in temperature