Gas # of Moles, Increase the pressure

[emily c]

I dont understand why if you increase the pressure on a system of gasses, the reaction does move towards the end that has a lesser number of gas mols. It seems that it would make more sense for a higher pressure to change the K value so that the gasses take up "less space"

[Meredith Shuffett 2C]

I believe this has to do with the PV=nRT equation. If you increase the Pressure, you are decreasing the Volume, and since volume and number of moles are proportional to each other (V=n/M) then the concentration will increase, thus causing the reaction to go in the other direction.

[Harnadar Anand 2F]

As the pressure increases, the side of the equation with less moles of gas makes up for the decrease in volume because the decrease in volume is what actually increases the pressure.

[Vanessa A 3F]

So if the pressure decreases, the reaction shifts towards the less moles of gas side? How about when the volume decreases? What side does it proceed to and how does it affect concentration