van der Waals gas


by winterwind
Tags: waals
winterwind
winterwind is offline
#1
Sep18-09, 06:09 PM
P: 29
1. The problem statement, all variables and given/known data
Calculate the isothermal compressibility and the expansion coefficient of a van der Waals gas. Show, using Euler's chain relation that

[tex]\kappa[/tex]TR = [tex]\alpha[/tex](Vm - b).

2. Relevant equations
van der Waals equation
virial expansion of state

3. The attempt at a solution
So I have to figure out
-isothermal compressibility of van der Waals gas
-expansion coeffcient of a van der Waals gas
-show that the above equation is true using Euler's chain relation.

I guess the first part has something to do with compressibility factor Z? I used Z = PV/RT and then plugged for p the van der Waals gas law. Probabaly incorrect.

The second and third part I have no idea.
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