Posted by **Carly** on Thursday, January 14, 2010 at 9:06pm.

hi! this question confuses me.

"Pennies have mass of approximately 2.5 g. How many pennies are needed to make a mole of copper?"

if anyone can help, that would be amazing. <3

Thank you!

- Chemistry -
**DrBob222**, Thursday, January 14, 2010 at 9:28pm
A mole of copper (if we take the average of all of the isotopes of copper) is about 63.5 grams. You can look up the exact atomic mass if you wish. So a mole of copper is 63.5 grams. How many pennies does it take to make 63.5 grams?

- Chemistry -
**Carly**, Thursday, January 14, 2010 at 9:36pm
25.4.

Thank you so much! :)

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