# Homework Help: Van der Waal's equation of state

1. Nov 30, 2004

### n_anniemae

Help me on this one - Van der Waal's equation of state

suggest ways of reconciling Van der Waal's equation of state with experimental observations

Last edited: Nov 30, 2004
2. Nov 30, 2004

### HallsofIvy

Do you know what Van der Waal's equation is? What are the experimental observations and why should Van der Waal's equation need "reconciling".

3. Dec 1, 2004

### n_anniemae

Vander Waal's equation is given as (P+A/v2)(v-b) = RT which is an approximate theoretical treatment. The molecules are treated as hard attracting spheres and the term a/v2 arises from the intermoleculer attractions. Both a/v2 and b are first approximations only and were used to give 1st order derivations from the ideal gas law.
As compared to experimantal results, the VDW equation of state comes short.I would like to suggestions of how to overcome these short comings so as to be able to reconcile the equation with the experimental results.

4. Dec 1, 2004

### n_anniemae

Vander Waal's equation is given as (P+A/v2)(v-b) = RT which is an approximate theoretical treatment. The molecules are treated as hard attracting spheres and the term a/v2 arises from the intermoleculer attractions. Both a/v2 and b are first approximations only and were used to give 1st order derivations from the ideal gas law. PV=NRT
As compared to experimantal results, the VDW equation of state comes short.I would like to suggestions of how to overcome these short comings so as to be able to reconcile the equation with the experimental results.