In the reaction ( H_2(g) + I_2(g) \rightleftharpoons 2HI(g) ), if the reaction quotient ( Q ) is less than the equilibrium constant ( K ) (Q < K), it indicates that the system is not at equilibrium and will shift to the right to produce more HI. Consequently, the concentration of HI will increase as the reaction proceeds toward equilibrium.
HI will be consumed. The reaction will proceed to the left. More I2 will form.
The balanced equation for the synthesis of hydriodic acid from hydrogen gas and solid iodine is: H2 (g) + I2 (s) → 2HI (g)