The figure shows four forces exerted on a moving box, moving at a constant speed. A square is shown with an arrow pointing up labeled F3, an arrow pointing right labeled F1, an arrow pointing down labeled F4 and an arrow pointing left labeled F2

If the box continues to move with the same speed in the same direction, which statement is correct? (3 points)

a
F1 is equal to F4 and F2 is greater than F3.

b
F1 is equal to F2 and F3 is greater than F4.

c
F3 is equal to F4 and F1 is equal to F2.

d
F3 is equal to F4 and F1 is less than F2.

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