Answer to Question #160856 in General Chemistry for joseph rowland

Question

Red gold is a gold‑copper alloy used to make jewelry. A piece of jewelry made of red gold weighs 8.62 g

and has a volume of 0.475 cm

3

. Gold has a density of 19.3 g/cm

3

and copper has a density of 8.96 g/cm

3

. Calculate the percentage by mass of each metal in the jewelry. Assume the total volume of the jewelry is the sum of the volumes of the two metals it contains.

Answer 1

19.3x + 8.96y= 8.62

x + y= 0.475.

x= 0,421947674

y= 0,0530523256.

19.3 x 0,421947674 x 100%/8.62 = 94,4732031 % of gold.

And 100-94,4732031 = 5,5267969%. Of Copper