Homework Help: Chemistry

Posted by Danya on Thursday, September 20, 2012 at 10:58am.

A modern penny weighs 2.5 g but contains only .063 g of copper. How many copper atoms are present in a modern penny? Thanks in advance for any help you can give!

Chemistry - DrBob222, Thursday, September 20, 2012 at 2:48pm
How many mols Cu are in the penny?
That's mols Cu = grams Cu/atomic mass Cu.
Then mols Cu x 6.02E23 = atoms Cu.

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