Final answer:
To find the number of atoms in a 6.84g sample of nickel, divide the mass of the sample by the atomic mass of nickel to calculate moles, then multiply by Avogadro's number, resulting in approximately 7.02 × 10²² atoms.
Step-by-step explanation:
The question asks about the number of atoms in a 6.84g sample of nickel, which involves calculations based on Avogadro's number and the molar mass of nickel. To find out the number of atoms, we will first determine the number of moles of nickel using the given mass and the atomic mass of nickel, and then we will multiply by Avogadro's number.
Moles of Nickel = mass of the sample / atomic mass of nickel = 6.84 g / 58.69 g/mol = 0.1165 mol
Number of Nickel Atoms = moles of nickel × Avogadro's number = 0.1165 mol × 6.022 × 10²³ atoms/mol
Thus, the number of atoms in a 6.84g sample of nickel is approximately:
0.1165 × 6.022 × 10²³ = 7.02 × 10²² atoms.