Question

There are 3.20e22 atoms of copper in the outer shell of pennies. How many grams of copper is this?

Answer 1

I don't know what you mean by the outer shell of pennies but in 3.2oE22 atom of Cu there are
mols Cu = 3.20E22/6.02E23 = ?
Then g = mols Cu x atomic mass Cu = ?

Answer 2

3.38g