Register to reply

Van der waals gas

by ja87
Tags: waals
Share this thread:
Dec10-06, 01:31 PM
P: 2
1. The problem statement, all variables and given/known data
i must use van der waals gas equation to plot a pressure against volume graph for H2O. i must do 3 plots on one graph, one of the critical temperature given a point of inflection, one where temperature is less than the critical temperature giving a large dip in the graph, and one where T>critical temperature and hence gives a a curve where dp/dv is never =0.

2. Relevant equations
i have the van der waals equation :(p+a(1/v)^2)*(v-b) = n*R*T
and have rearranged to make p=-(-a(1/v)^2*v+a(1/v)^2*b+n*R*T)/(-v+b)
i also have a=0.5507, b=3.04*10^-5, R=8.314, n=1

3. The attempt at a solution

i have tried to plot a p(v) graph with these values in this equation (using Maple) using small, large and negative values for T and all i get is a graph that looks like a 1/x graph, i cannot get the desired dip for when T<critical temperature. am i using the wrong equation or are my numbers wrong.
Phys.Org News Partner Science news on
Scientists discover RNA modifications in some unexpected places
Scientists discover tropical tree microbiome in Panama
'Squid skin' metamaterials project yields vivid color display

Register to reply

Related Discussions
MATLAB & Van der Waals Math & Science Software 6
Van Der Waals forces Biology, Chemistry & Other Homework 3
Van der Waals' forces Chemistry 2
Van der waals gas General Physics 1
Van der waals Advanced Physics Homework 0