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Pressure in terms of mols

Posted: Fri Jan 18, 2019 12:29 pm
by 305174946
Is the pressure lower when there are less mols because they are less collisions? or why?

Re: Pressure in terms of mols

Posted: Fri Jan 18, 2019 2:00 pm
by 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.

Re: Pressure in terms of mols

Posted: Fri Jan 18, 2019 5:12 pm
by 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.

Re: Pressure in terms of mols

Posted: Wed Jan 23, 2019 11:46 am
by 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.