To determine the mass of 1.204×10²² atoms of lead, we need to use the molar mass of lead and convert the number of atoms into moles.
The molar mass of lead (Pb) is approximately 207.2 g/mol.
First, let's convert the number of atoms to moles:
Number of moles = Number of atoms / Avogadro's number
Number of atoms = 1.204×10²² atoms
Avogadro's number = 6.022 × 10²³ atoms/mol
Number of moles = 1.204×10²² atoms / (6.022 × 10²³ atoms/mol) ≈ 0.02 mol
Now, we can calculate the mass using the number of moles and the molar mass of lead:
Mass = Number of moles × Molar mass
Mass = 0.02 mol × 207.2 g/mol = 4.144 g
Therefore, the mass of 1.204×10²² atoms of lead is approximately 4.144 grams.