Suppose you have equal amounts of three substances labeled A, B, and C. Then you add 350 mL of water to each, and then wait so that each one has time to absorb all of the water that it can. 25 mL of surface water remains above substance A. 80 mL of surface water remains above substance B. 65 mL of surface water remains above substance C. Which of the substances has the lowest porosity?

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

the answers are

c and c