Q1. A 9-carat gold ring is made from a mixture of metals.
The table below shows the mass of different metals in the ring.
The mass of the ring is 5.0 g

Metal Mass of metal in g
Gold 1.9
Silver 2.8
Copper 0.3
(a) Plot the data for copper from the table above on the graph below.

(2)
(b) The cost of gold is £30 per gram.
Calculate the cost of the gold used in the 9-carat gold ring.
Use the table above.


Cost of gold = £

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/4zZs6GM

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