Question 14 (01.06 MC)
The contents of two petri dishes are described in the table.
Contents of Petri Dishes
Petri Dish
Contents Final State of the Substancel
lelemental sulfur
fine yellow colored powder
D compound sodium chloride white colored cubic crystals
Based on the final state, which statement is true about the substances in the petri dishes? (1 point)
Oa
The final substances in both petri dishes are mixtures.
Ob
The final substances in both petri dishes are pure substances.
Ос
The final substance in Petri dish C is a pure substance and in Petri dish D is a mixture.
Od
The final substance in Petri dish C is a mixture and in Petri dish D is a pure substance.

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