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In chemical reactions, we have several options to increase the pressure for reactions that have gas phase reactants or products. We typically don't talk about the pressure in a reaction when no gases are involved.
1. Use Le Chatelier's principle to add or remove reactants or products to change the amounts of gas and therefore change the pressure.
2. Change the volume of the reaction vessel which will also use LeChatelier's principle. Increasing the reaction container volume will decrease the total pressure as well as the partial pressures. Decreasing the volume will increase the total and partial pressures.
3. The addition of an inert gas will increase the total pressure of the system but will not change the partialpressures of any of the components of the system so it will not affect the equilibrium of the reaction.
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