Sketch qualitative a plot of compressibility factor z versus mole fraction (from zero to unity) at constant temperature and pressure, for the following mixture at 25 bar: (a) dimethylamine [hn(ch3)2]/h2 at 170 °c. (b) dimethylamine [hn(ch3)2]/hcl at 170 °c. (c) ar/hcl at 80 °c in the sketch indicate where z -1 (hint: you need to compute z values of the pure forms of these 4 gases at p and t given and use them as benchmarks)

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole