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What is the charge on the electrons in a nickel coin, assuming it's made of nickel? A nickel coin has a mass of about 4.99 grams, nickel is atomic number 28, and each mole (6.02 x 1023 atoms) of nickel has a mass of 58.7 grams. Include units in your answer.

User Howler
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Step-by-step explanation:

We have a nickel coin and its mass is 4.99 grams. With the molar mass we can find the number of moles of Ni that we have in the coin.

mass of Ni coin = 4.99 g

molar mass of Ni = 58.7 g/mol

moles of Ni = mass of Ni/molar mass of Ni

moles of Ni = 4.99 g/(58.7 g/mol)

moles of Ni = 0.0850 mol

So, the coin has 0.0850 moles of Ni. We know that 1 mol of Ni contains 6.02 * 10^23 atoms. We can find the number of atoms of Ni that we have in the coin.

1 mol of Ni = 6.02 *10^23 atoms of Ni

atoms of Ni = 0.0850 mol * 6.02*10^23 atoms of Ni/(1 mol)

atoms of Ni = 5.12 *10^22 atoms

We found that 1 nickel coin has 5.12 *10^22 atoms of Ni. The atomic number of Ni means that one atom of Ni has 28 protons. Since the charge of the Ni atom is zero, the Ni atoms also has 28 electrons.

atomic number of Ni = 28 = n° of protons = n° of electrons

number of electrons = 5.12 *10^22 * 28 electrons/atom

number of electrons = 1.43 * 10^24 electrons

The coin has 1.43 *10^24 electrons. The charge of one electron is 1.6 *10^(-19) Coulombs. Finally, we can find the charge of electrons in a Ni coin.

1 electron = 1.6 *10^(-19) Coulombs

charge of electrons = 1.43 *10^24 electrons * 1.6 *10^(-19) Coulombs/electron

charge of electrons = 2.29 *10^5 coulombs

Answer: The charge on the electrons in a nickel coin is 2.29 * 10^5 coulombs.

User Krishna Kankal
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