We can use T & P to calculate TR and PR and use the Generalized
Compressibility Charts to determine Z & VRideal. Then, we can use either Z or VRideal to determine the
molar volume. The values we get for the molar volume should agree within
/ Data / Solve:
Begin by collecting
all of the constants needed for all Generalized
Compressibility Equation of State.
g NH3 / mol NH3
Given TR and the ideal reduced molar volume, use the compressibility
charts to evaluate either PR or the
compressibility, Z. TR, PR and Z
are defined as follows.
Because we know both T and P, we can immediately plug values into Eqns 1 & 2.
Read the Generalized Compressibility
Chart for PR = 0 to 7 :
We can solve Eqn 3 for the molar volume and use
the value of Z we just
found to evaluate V.
Plugging values into Eqn 4 yields:
could us the ideal reduced molar volume that we found on the Generalized
Compressibility Chart to determine the molar
Now, we can solve Eqn 5 and plug in values to
There are no assumptions
These values differ by
less than 3%. If you read the
chart correctly, they should agree to within about 5%.