Pressure in terms of mols

[305174946]

Is the pressure lower when there are less mols because they are less collisions? or why?

[Brian Chhoy 4I]

In part, yes. The less moles there are, the less molecules you have colliding with the surface of the container and thus applying less pressure. Also consider the equation PV= nRT, as the number of moles decreases, the pressure has to decrease.

[michelle]

It depends on how you decrease the pressure. You can either increase the volume or introduce other unrelated gases.You can then relate the change in pressure with the change in moles.

[Sophie Roberts 1E]

Consider pressure in terms of volume as well. When the number of moles stays the same and the volume decreases, the pressure will increase because now there is a more concentrated system. Same vice versa, when the volume increases, the solution is less concentrated so the pressure decreases.