Hexane mean free path
Hexane mean free path
(OP)
I am looking for the mean free path of Hexane gas (at 0.7 bar 80 deg C) or a way of calculating it. If I knew the molecular diameter I could calculate it from that - but I have had no luck on the web as yet.





RE: Hexane mean free path
The collision diameter (kinetic theory) can be estimated from the thermophysical parameters as follows:
σ2 = (2/3)(M.R.T)0.5/(Nπ1.5η)
M= 86.18
R = 8.314×107
T = 353
π = 3.14
N = 6.02×1023
η = 7.85×10-5 taken from NIST
I got for the estimated collision diameter σ = 6.37 ×10-8 cm = 0.637 nm.
Of course, the collision diameter can be estimated by other methods. I don't know the accepted error % in all the estimates.
RE: Hexane mean free path
The estimated mean free path (kinetic theory, ideal gas) would then be 3.81×10-8m.
Please check my calculations.