Changes in volume

[DArcy Perlman 1C]

Could someone explain how changing the volume and the moles of gas on either side of the reaction are related?

[Angela Harrington 2L]

Because of PV=nRT, increasing mols increases volume and decreasing mols decreases volume. They are on opposite sides of the equals sign, so they are directly proportional. In the case of K and Q, whichever side of the reaction you increase one, then the reaction will shift away from that side, but whichever side of the reaction you decrease one, then the reaction will shift towards from that side.

[Chiara Frank]

Hi! When the volume of a system is reduced, the direction of the system will tend towards the side of the reaction that has fewer moles of gas, thus the side that will relieve the pressure within the system. And vice versa, if the volume of the system is increased, the system will tend in the direction of the side with more moles of gas, following Le Chatelier's Principle. I hope this was helpful!

[Katie 3H]

What if we ask in terms of pressure? What happens to the reaction when pressure is increased.

[Ameen Shaheen 2I]

As volume decreases, the reaction will favor the side with less moles due to pressure differences. The opposite can be said regarding the increase of volume

[Claire Kim 1F]

Could someone explain how changing the volume and the moles of gas on either side of the reaction are related?

This is dependent of PV=nRT. Since moles and volume are on opposite sides of the PV=nRT equation, if one goes up so does the other. If volume increases, moles increases. If volume decreases, moles decreases.

[Ellie Fox 2K]

As volume decreases, system favors the direction of the reaction that has fewer moles of gas and vice versa.

[N Kanuri 2E]

What if we ask in terms of pressure? What happens to the reaction when pressure is increased.

Pressure and volume are inversely related, and typically when a problem asks about increasing/decreasing pressure, the assumption is that volume is being increased/decreased.

When pressure is increased, volume is being decreased --> shift towards side of reaction with less gaseous moles.
When pressure is decreased, volume is being increased --> shift towards side of reaction with more gaseous moles.

[Amine Adlouni 1L]

Volume and moles of gas are related by pressure. As we know from Le Chatelier's principle, a reaction's equilibrium will shift depending on a change provided. As such, if moles of a reactant increase, the moles of product will increase. Like wise, if moles of product increases, moles of reactants increases. If the volume increases, the side of the reaction with more moles will be favored. If the volume decreases, the side of the reaction with less moles will be favored.

[davis sandberg 2H]

decreasing volume or increasing moles of gas will favor the side of the reaction with net fewer moles of gas

[RobinFong_2B]

a decrease in volume means an increase in pressure, thus the side of the reaction with fewer moles would be favored. Think about it as when there is less space available, the side of the reaction where less of the limited space is taken up is favored.

[Miranda Hess 3I]

Decrease in volume means that the reaction will be pushed to the side of the reaction with less moles of gas.

[Jacquelyn Rivera 2I]

When you decrease the volume, the reaction will favor the side with less moles of gas.

[Tyler Triviz 2L]

Note that changing the volume does not affect the equilibrium constant because it is not in the PV=nRT equation.