23. A spacecraft is drifting at a constant speed of 500m/s fa 20N Force is applied to the front of the craft and a 20N force is applied to the back of the craft, what will be the result?
a. The spacecraft will stop with the balanced forces
b. The spacecraft will continue at the same speed with the balanced forces
C. The spacecraft will increase its speed forward
d. The spacecraft will decrease its speed forward

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