An 18 Karat Gold Necklace Is 75 Gold By Mass 16 Silver And 9 0 Copper How Many G

An 18-karat gold necklace is 75% gold by mass, 16% silver, and 9.0% copper. How many grams of copper are in the necklace? If 18-karat gold has a density of 15.5 , what is the volume in cubic centimeters?

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