Red gold is a gold-copper alloy use to make jewelry. A piece of jewelry made of red gold weights 9.82 and has a volume of 0.683 and has a density of 19.3 /cm3 and copper has a density of 8.93 g/cm3. calculate the % by mass of each metal in the jewelry. Assume the total volume of the jewelry is the sum of the volumes of the 2 metals it contains.