# Problem: 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?

🤓 Based on our data, we think this question is relevant for Professor Barondeau's class at TAMU.

###### Problem Details

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?

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Mole Concept concept. You can view video lessons to learn Mole Concept. Or if you need more Mole Concept practice, you can also practice Mole Concept practice problems.

What is the difficulty of this problem?

Our tutors rated the difficulty ofPrecious metals are sometimes weighed in old-timey units lik...as medium difficulty.

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What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Barondeau's class at TAMU.