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The general rule for change in pressure is that if the pressure has increased the side of the reaction with fewer moles is favored. This, however, only applies if the pressure is changed by changing the volume because then the concentrations change.
Le Chatelier's principle states that the chemical reaction will adjust to minimize the effects of changes such as the change of reactant added, change of product added, or change of pressure. Specifically for pressure, if the pressure of the reaction increases or the volume decreases then the reaction will shift to the side with less moles of gas while if the pressure of the system is decreased or volume is increased, the reaction will shift toward the side with more moles of gas.
If the volume decreases and more moles of gas are on the left, the reaction shifts to the right. If the volume decreases and there are more moles of gas on the right, then the reaction shifts to the left. The reaction responds to minimize the effect of increasing pressure (by decreasing volume).
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