A coin dealer offers to sell you an ancient gold coin that is. 2.2 cm in diameter and 3.0 mm in thickness. (a) The density of gold is 19.3 g/cm3. How much should the coin weigh if it is pure gold? (b) If gold sells for $640 per troy ounce, how much is the gold content worth? (1 troy ounce = 31.1 g).
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