Final answer:
The molar mass of Pb is approximately 207.2 g/mol. The mass of 3.81×10^22 Pb atoms is 13.10 grams.
Step-by-step explanation:
To find the mass of 3.81×10^22 Pb atoms, we need to know the molar mass of lead (Pb). The molar mass of Pb is approximately 207.2 g/mol. We can use this information to convert the number of Pb atoms into grams.
Step 1: Convert the number of atoms into moles. 3.81×10^22 atoms ÷ 6.022×10^23 atoms/mol = 0.0632 mol.
Step 2: Convert moles of Pb into grams. 0.0632 mol × 207.2 g/mol = 13.10 g. Therefore, the mass of 3.81×10^22 Pb atoms is 13.10 grams.