Will give brainliest! the first known telescopes, used around 1600, consisted of a lens and an eyepiece. today, telescopes are often computer controlled and consist of a complicated array of sophisticated lenses. which statement correctly describes how telescopes have changed over time? a. the telescopes of the 1600s were used until the year 2000, when a more sophisticated telescope was built. b. the telescopes of the 1600s were gradually improved upon over time, resulting in the telescopes that are available today. c. the telescopes of the 1600s were used until the year 1900, when a more sophisticated telescope was built that was used until the year 2000. d. the telescopes of the 1600s were abandoned after about 50 years, and the technology was completely replaced.

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