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A dealer who buys used jewelry wants to know if an item being offered for sale is pure gold or a mixture of metals. If the item has a mass of 92.6 g and displaces 4.8 cm3 of water, is the item pure gold? (The density of pure 24 karat gold is 19.3 g/cm3.)
Because 92.6 g/4.8 cm3 is 19.3 g/cm3, the item is pure gold.