Select the correct answer. A sealed, flexible container held 250 mL of a substance. The volume of the container was then decreased to 100 mL without any matter
escaping. What must be true about the matter in the container before the container's volume was changed?
OA .
It would have kept its shape if transferred to another container.
OB.
Its particles were held together tightly in a rigid structure.
OC. Its particles were in constant, rapid motion.
OD
It was all located at the bottom of the container.

the answer to this question is 3.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

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