Work problem 7.18, then obtain an expression for the fugacity. Determine the value of c (+/- 0.5) that best represents the vapor pressure of the specified compound below. Use the shortcut vapor pressure equation to estimate the experimental vapor pressure for the purposes of this problem.

(a) CO₂

(b) Ethane

(c) Ethylene

(d) Propane

(e) n-Hexane

Data from problem 7.18

Consider the equation of state

where η_P = b/V. The first term on the right-hand side is known as the Carnahan-Starling equation for the hard-sphere compressibility factor.

Determine the relationships between a, b, c and T_c , P_c, Z_c.

What practical restrictions are there on the values of Z_c that can be modeled with this equation?

Transcribed Image Text:

Z = 2 3 - 1- Пр+ Пр - ПР (1 - Пр)3 а пр bRT