Hexane mean free path

[cuckooclock]

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.

 

[25362]

The collision diameter (kinetic theory) can be estimated from the thermophysical parameters as follows:

[σ]² = (2/3)(M.R.T)^0.5/(N[π]^1.5[η])

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.

 

[25362]

The estimated mean free path (kinetic theory, ideal gas) would then be 3.81[×]10^-8m.

Please check my calculations.