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 = £

15) a substance used in manufacturing gasoline consists of finely divided platinum supported on an inert solid. suppose that the platinum is formed by the high temperature reaction between platinum (iv) oxide and hydrogen gas. the other product is water. a) write and balance the equation b) how many grams of hydrogen are needed to produce 1.0 g of platinum metal? c) how many moles of water are produced at the same time? how many grams? ( show work, .)