Precious metals are sometimes weighed in old-timey units like “troy ounces”, where 1 troy ounce = 31.1035 grams. A platinum coin is made that weighs 0.5003 troy ounces. The coin has a radius of 13.5 mm and a thickness of 1.28 mm. (Useful information: volume of a cylinder = (π r2)h where r is radius, and h is height or thickness)
a) What is its density, in g/cm3?
b) How many atoms of platinum are in the coin?
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