The reaction between hydrogen gas H2 and iodine gas I2 to form hydrogen iodide 2HI can be represented by the following balanced equation:H2 g + I2 g 2HI g This reaction is reversible and reaches a state of equilibrium. According to Le Chatelier's principle, if a system at equilibrium is subjected to a change in pressure, temperature, or concentration of reactants or products, the system will adjust itself to counteract the change and restore a new equilibrium.In this case, increasing the pressure on the system will cause the reaction to shift towards the side with fewer moles of gas to counteract the increase in pressure. Since there are 2 moles of gas on the reactant side 1 mole of H2 and 1 mole of I2 and 2 moles of gas on the product side 2 moles of HI , the number of moles of gas is the same on both sides of the equation.Therefore, increasing the pressure will have no effect on the position of the equilibrium or the rate of the reaction between hydrogen gas and iodine gas to form hydrogen iodide, as the number of moles of gas is the same on both sides of the reaction.