How Are Mole Fractions Related To The Atomic Weights Of Each Gas Element?
Still worrying about this?
As a rule, we don’t have a relation between mole fraction and molar mass because mole fraction is ratio of the number of molecules, not a ratio of the masses of the molecules.
If you have to make a connection you could do something like this, which continues with the mixture of N2 and Xe that I used.
X(N2) = moles N2 / (moles N2 + moles Xe)
since moles = mass / molar mass (n = m / M)
then we can force mole fraction to include the molar masses
X(N2) = (m(N2) / M(N2)) / ( m(N2) / M(N2) + m(Xe) / M(Xe) )
Add comment April 27th, 2009