Posted by **Tiffany ** on Thursday, February 7, 2013 at 3:00pm.

We want to ﬁnd how much charge is on the

electrons in a nickel coin. Follow this method.

A nickel coin has a mass of about 4.9 g.

Find the number of atoms in a nickel coin.

Each mole (6.02 × 10

23

atoms) has a mass of

about 58.1 g.

Answer in units of atoms

Find the number of electrons in the coin. Each

nickel atom has 28 electrons/atom.

Answer in units of electrons

Find the magnitude of the charge of all these

electrons.

Answer in units of C

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