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Additionally, if the pressure increases the reaction will shift towards the side of the equation with less moles to counteract the change. If the pressure decreases the reaction will shift towards the side of the equation with more moles.
When a question tells you there s a change in pressure, you need to know more than that to see which side the reaction will shift to. If there was an increase in pressure because there was a decrease in volume, then the reaction favors the side with the fewer moles of gas. If there was an increase in pressure from adding an inert gas, the reaction will not favor any particular side because adding an inert gas doesn't change the concentration of any of the reactants or products.
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