Kp is generally used when the reaction involves gaseous reactants and products. For example, reaction between hydrogen and iodine to form hydrogen iodide.
10）Haber Process
Haber process involves the production of ammonia from nitrogen and hydrogen gas. Recall that the reaction is exothermic and that 1 mol of nitrogen gas reaacts with 3 mol of hydrogen gas to produce 2 mol of ammonia gas. By Le Chatelier's Princple high pressure and low temperature will increase the proportion of ammonia at equilibrium.
However industrially a high temperature of 450 degrees and a pressure of 250 atm is used. Although the yield of ammonia is lower at higher temperature, using a low temeprature reduces the rate of reaction making the process uneconomical. Fe is also used as a catalyst to speed up the rate of reaction.
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