Just to put it out there.
n= number of Moles in system
R= Gas constant (0.8026 or something)
moles= mass/ Molar Mass(mass of all elements, e.g. N2=28 amu)
Also, adding to ricki's explanation of oxygen and nitrogen diffusion. Oxygen gas(O2) should diffuse slower than Nitrogen gas(N2) because the molecular weight of oxygen gas is more than Nitrogen gas. However Oxygen only makes a single bond with another oxygen, while Nitrogen makes a triple bond to another Nitrogen(to complete the octet rule(8 electrons surrounding one element)). So Oxygen is smaller than Nitrogen, making it diffuse slower.
Last edited by The Meat : 10-01-2012 at 12:59 PM.
Reason: Science is awesome!!!