Discussion
Consider the following statements about cubic equations of state.
1. They can be solved analytically or by iteration for volume.
2. They can represent both liquid and vapour phases with one equation.
3. They are more accurate than the virial equation at all conditions.
Answer: A
The first two are correct and are the reasons cubics dominate process simulation. The third overstates the case, because a truncated virial equation with good coefficients is more accurate in the moderate pressure gas region.
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