Outline how the relative thermal stabilities of these hydrides vary from HCl to HI.
Explain the variation you outlined in (i).
Hydrogen iodide is produced by heating hydrogen gas with iodine vapour, but the reaction is incomplete.\n\n$\text{H}_2(g) + \text{I}_2(g) \rightleftharpoons 2\text{HI}(g)$\n\nWrite an expression for $K_c$ and state the units.
For this equilibrium, the equilibrium constant $K_c$ is $140$ at $500\,\text{K}$ and $59$ at $650\,\text{K}$.\n\nUse this information to state and explain the effect of increasing the pressure on the equilibrium.
For this equilibrium, the equilibrium constant $K_c$ is $140$ at $500\,\text{K}$ and $59$ at $650\,\text{K}.\n\nUse this information to state and explain the effect of decreasing the temperature of the equilibrium.
A mixture containing $0.02\,\text{mol}$ of hydrogen and $0.02\,\text{mol}$ of iodine was put into a $1\,\text{dm}^3$ flask and left until equilibrium was reached at $650\,\text{K}$. Calculate the amount, in moles, of each substance in the equilibrium mixture at $650\,\text{K}$ for $\text{H}_2(g)+\text{I}_2(g) \rightleftharpoons 2\text{HI}(g)$.