# chemistry

A coin dealer offers to sell you an ancient nickel coin that is 3.1 cm in diameter and 4.65 mm in thickness.

A) The density of nickel is 8.9 g/cm3. How much should the coin weigh if it is pure nickel? (in grams)

B) If nickel sells for \$0.216 per troy ounce, how much is the nickel content worth? (1 troy ounce = 31.1 g)

My attempt:
Volume=pi(1.55)^2(.465) that's all

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3. 👁 287
1. your volume equation is correct now multiple through.

remember that density = mass/volume
now arrange the equation to find the mass

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posted by Mia
2. So mass is 32.1? grams

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posted by Abe
3. For part B what proportion do I have to do?

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posted by Abe
4. I think you put your numbers backwards. You should have gotten 31.2 grams

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posted by Mia
5. O thanks and how do i start part B. I don't understand

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posted by Abe
6. Are sig figs important for this problem?

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posted by Mia
7. Yes

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posted by Abe
8. Okay for B you simply divide the actual mass of the coin by the grams equivalent to a troy ounce.

31.2 g/31.1 g = 1.00

Luckily they have approximately a 1 to 1 ratio

Multiply 1.00 * \$0.216 which is \$0.216

With the correct number of sig figs it would be \$0.22

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posted by Mia
9. Thank you so much!!!!!!!!!!

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posted by Abe
10. you're welcome

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posted by Mia

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