A nickel coin has a mass of about 4.9 grams. What is the number of atoms in a nickel coin?

To estimate the number of atoms in a nickel coin, we can use the molar mass of nickel and Avogadro’s number.

The molar mass of nickel (Ni) is approximately 58.69 grams per mole. This means that one mole of nickel contains about 58.69 grams of nickel atoms.

Now, we can calculate how many moles of nickel are in a 4.9-gram nickel coin:

Number of moles = mass (g) / molar mass (g/mol)

Number of moles = 4.9 g / 58.69 g/mol ≈ 0.0835 moles

Next, we will use Avogadro’s number, which is approximately 6.022 x 10²³ atoms per mole, to find the number of atoms:

Number of atoms = number of moles x Avogadro’s number

Number of atoms = 0.0835 moles x 6.022 x 10²³ atoms/mole ≈ 5.03 x 10²² atoms

So, there are approximately 5.03 x 10²² atoms in a nickel coin.