Nickel Coin
How do you find the # of atoms in a nickel coin?
We want ot find out how much charge is on the electrons in a nickel coin. Follow this method: teh bickel coin has a mass of about 5.4g. Each mole(6.02 x 10^23) has a mass of about 57.9 g.
-Find the number of atoms in a nickel coin, answer in units of atoms.
-Find the number of electrons in the coin. When each nickel atom has 28 electrons/atoms. Answer in units of electrons.
-find the magnitude of teh charge of all these electrons. Answer in units of C.
Take the mass and divide by molecular mass (5.4/57.9). this gives you # of moles in the coin. Multiply this by Avogadro’s number (6.02×10^23) to get number of atoms.
If there is 28 electrons in an atom and you have x number of atoms, you just multiply the #of atoms by 28 to get electrons.
Multiply the number of electrons by the fundamental charge. 1.60217646 × 10^-19. This gives you total charge on the electrons. Be sure to answer in a negative number since electrons have negative charge!
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